Date: Sat, 23 Nov 2013 14:27:02 +1300
From: A K <faker11235@hotmail.com>
Subject: Chris Hemsworth and Asa Butterfield

This story is fiction and is not intended to imply anything about the true
sexuality of the celebrities mentioned or any personal knowledge about
their private lives. Please enjoy, and if you can donate to Nifty, who
bring you all these wonderful stories.



Chris generally avoided these movie premiers, he got enough paparazzi
attention just trying to do some shopping, let alone walking into the
"lion's den". But Ender's Game was a book he had read, and enjoyed, as a
kid, and the lead Asa Butterfield was a tight young thing and he wanted a
glimpse of him. Chris' hair was cut short, as he had finished the filming
for Thor, and he was dressed in a black three piece suit, with tie.

While talking with one of the news reporters lining the red carpet, he saw
Asa making his way up the other side, giving the occasional handshake and
comment with fans and reporters. Chris was keeping his interest low-key,
with all the cameras around, so he didn't notice the young star come up
behind him. The reporter's eyes widened slightly, cueing the appearance to
Chris. He turned round and was shocked to see the young man, but composed
himself quickly.

"I'm very much looking forward to the next Thor movie, Chris," the young
star stated, looking up and down Chris' muscular frame.

"Well," Chris replied, sounding slightly hesitant as he tried to hide his
interest in the young man before him. Asa was dressed in a shirt and pants,
no tie, with the top few buttons on the shirt undone and the sleeves rolled
up to his elbows. "I'm interested in seeing you in this one too. I read the
book once, years ago, and hope you've pulled it off well."

"Well I think we've done pretty well," Asa was looking straight at Chris'
eye now, who was trying to break eye contact without looking evasive or
nervous. Asa quickly winked at him and continued wandering up the carpet
towards the cinema.

Chris stared at the boy's receding back for a moment longer before excusing
himself from the cameras and heading into the cinema. He made a beeline for
the toilets and hid himself away. He was slightly worried that someone
would notice what had just occurred on the carpet. It wasn't the first time
he had taken an interest in one of his fellow celebrities, but he'd never
gone after one so young. He wasn't even sure if it was legal, the boy being
only sixteen. He was pretty sure no-one had noticed his interest, and he
composed himself and headed into the atrium for the show.

He didn't even think about Asa's interest, nor what he had said.


The movie was great, and he enjoyed seeing Asa save the world as Ender. He
was walking back to his car, jacket slung over his shoulder, when he heard
a voice call his name behind him. It was one of the cinema valets, dressed
in a red jacket with some silly matching hat on.

"Excuse me, Mr Hemsworth, sir. I was asked to give this to you," the man
held a sealed envelope in his hand.

"Thanks mate," Chris replied and tipped him a twenty. The man dipped his
cap and raced back to the building. Chris waited until he was inside the
car before opening the envelope. Written on a piece of paper was the name
"Asa" and a cell phone number. He entered the number into his phone and
tried calling it.

"Hello?" the instantly recognisable voice of Asa Butterfield slipped out of
the phone.

"Umm, hey. That valet gave me your number, I s'pose," he replied
nervously. In fact, all he wanted to do was smash the phone, throw it out
the window and hide under his bed for a week. Chris had no idea what was
going on.

"Chris, hey," Asa said, sounding relieved. "I hope I didn't freak you out
earlier when we were talking, I could see you were kinda nervous. I wanted
to make it up to you."

"Hey, it's all good man," Chris responded, sounding a bit more jovial. He
thought he was out of the woods now. "No harm done. I'll leave you to your
after-party; it'll be pretty good by the looks of the people there
tonight."

"Eh, I never like those big gatherings, I end up feeling lost. I was hoping
we could talk," he sounded hopeful, almost endearing, pleading to Chris'
ear.

"Ahh, well, I guess I can," Chris was feeling nervous again. Him, and Asa,
possibly alone.

"Awesome. The studio put me up in a suite all on my own at a hotel." He
gave Chris the name and room number he was staying at. "See you soon,
Thor," Asa said, and hung up.

"Yeah, see you soon," Chris whispered to the handset, slightly
confused. Was Asa trying to tease him?



He pulled up to the hotel. It was one he had stayed in before; Hollywood
studios had a tendency to use the same hotels to house their
people. Probably something to do with getting discounts, and providing
discretion, Chris thought cynically. He was happy about that though, he had
on occasion met up with guys while staying at places like this. No-one had
ever bat an eye nor had anything ever come out in the press because of it
either. Of course, he was always discreet.

He entered the elevator and headed up to the room Asa was staying in. He
cautiously walked the hallways until he found the right door. He knocked,
and waited impatiently outside, hoping no-one would see.

The door opened and Asa smiled out the door at him. Chris felt caught in
the bright blue eyes that he had seen in so many pictures, eyes that were
so much brighter and more beautiful in reality. Before saying anything, he
quickly entered the room and closed the door. Asa quickly stepped back, and
watched Chris with a bemused expression on his face.

"Don't worry, everyone else went to the after-party, it's all movie people
on this floor. In any case, what are you so concerned about?" Asa asked in
a cheeky tone.

Chris turned around to face him, one hand still on the door knob, and
replied, "You sound like you've got something to hide here too," a big
smile on his face. Chris had a pretty good feeling he knew where this was
going, but held off saying it aloud.

"Maybe things will be clearer in here," Asa stated, and wandered through
the hallway into one of the rooms. Chris entered the room and found himself
in the lounge, with Asa sitting comfortably in an armchair. Unlike Chris,
who was still decked out in shirt, tie, waistcoat and pants, Asa had had
time to change into track pants and a t-shirt. Chris liked what he saw, and
moved himself onto the couch opposite him. He lay himself down and
stretched out, his legs dangling off the end. Turning towards Asa, he
couldn't help but notice the way the boy's eyes were attracted to his
enormous torso, barely contained within his clothes, before the boy looked
across and saw Chris watching him. He coloured slightly before saying,
somewhat nervously, "I was hoping you would come."

"Yeah, you've got some pretty sweet digs here," Chris replied, feigning
ignorance of the young man's attentions. His arms stretched and swept the
breadth of the room, indicating how big the room was; all the while
watching Asa's eyes as they were glued to his enormous biceps as they
flexed.

"Yeah, they are pretty sweet," Asa murmured, distracted by the sight of
Chris' muscles moving around so close to him. He had watched all of Chris'
movies many times, especially the various shirtless scenes, and had even
gone back and found videos from his days on the Aussie soap "Home and
Away". He wanted to rush forward and worship the muscle god before him but
was suddenly overcome by fear. Chris appeared to be oblivious to his
interest. He sat in his chair, watching, beginning to feel anxious and
nervous.

Chris spent the entire time watching the boy, and could read the emotions
currently squirming in his head writ large across his face. His own
horniness was growing by the second, watching as the young man was stuck in
indecision. Knowing the boy was waiting for some sign, some indication of
interest, he merely said, "Asa," in a slow, sing song voice.

The boy's eyes immediately locked onto Chris', who gave him a quick wink
and a grin. Asa leapt out of his chair and into the open arms of the muscle
man. Chris enfolded the boy in a strong embrace and locked lips with
him. Both men were passionate with each other, allowing their tongues to
roam and pleasure one another as their hands began to wander. Asa moved his
hands up and into Chris' hair. While not being as long as it was in the
Thor movies, there was still plenty of it and he stroked, mussed and pulled
on it in equal measures. Chris allowed his hands to roughly fondle the
boy's back as he moved them towards the young man's arse. He grabbed hard
and he could feel the tight young buns as he kneaded them with his strong
fingers. He pushed the boy into him, grinding their crotches together.

Asa leaned away from the kiss as he felt the massive star beneath him sit
up, keeping his arms around the stud's neck. Chris still had his hands
locked firmly on the boy's arse, and their eyes were locked together
too. Asa breathlessly, yet seductively said, "I want to see the rest of
you."

"Nothing stopping you," Chris replied, excited to see what the boy would
do.

Asa moved slowly, bringing his hands down the Aussie's broad shoulders, and
across the heaving pecs. He could see that Chris was enjoying the
attention, and Asa observed the small shiver of delight as his fingers
flicked over the still-covered nipples. His fingers came to rest on the
buttons of the vest and he began undoing them one by one, slowly drawing
out the process. He leaned forward as he got about half way down, and
kissed Chris gently on the top of his collarbone, through the white dress
shirt. Once the vest was undone and quickly shrugged off by Chris, Asa
leaned back and loosened the tie, then began undoing the shirt's
buttons. He went quicker this time, eager to witness the muscled flesh. As
the top buttons yielded to his small, nimble fingers, he could see the
well-defined gap between the pecs come into view, which continued down his
bronzed torso to divide his beautiful defined abs. Chris was eager to show
himself off and the moment the last button was undone he ripped it off
himself, almost tearing the sleeves off in the process. His hands moved up
to remove the tie as well –

"Stop," Asa shouted, and Chris looked again, curiously, into those
beautiful blue eyes. "I want you to leave it on," he responded seductively.

"As you wish," Chris replied, quickly reaching forward and pulling off the
boy's t-shirt. Underneath the shirt, the boy had a smooth torso, with the
beginnings of pectoral muscles starting to develop. Chris was enjoying the
sight and brought his fingers up to the boy's small nipples and rubbed them
between his thumbs and the side of his index fingers. Asa moaned as he
leant forward onto the muscle god's chest, and began kissing the tan, taut
skin. Chris was built, and Asa loved it. He was kissing the pecs while
using his hands to rub the abdominal muscles, and he slowly moved himself
across to the large nipples proudly on display. They seemed almost lost on
the canvas that was Chris' beautiful chest. He started working on the right
one, licking it roughly with the flat of his tongue. He alternated this
motion with circular motions using the tip of his tongue, avoiding the
mound itself until he switched back to using the flat, and roughly licking
and sucking on it once more.

The nipple play was sending Chris into cloud nine, and he leaned back onto
the arm of the sofa, and Asa followed him down. Chris kept his hands roving
around the boy's body, coming back to his nipples and arse again and again
as Asa moved over to the left nipple to give it the same explosive
treatment. After more time on the left nipple, Asa began moving up Chris'
torso, moving across to the centre and following the line of pectoral
muscle as it moved up and around to his shoulder. He continued to kiss
along the collarbone, moving towards his neck, as his hands now roamed
higher, passing over the now-super-sensitive nipples and tweaking
them. Chris was continuously moaning as he did this, punctuated by deeper,
more animal grunts as various actions turned him on more. Asa continued up
the neck and towards the jaw, and Chris turned suddenly to capture the
young lips on his. More rough, passionate kissing ensued, as Chris wrapped
his arms tightly around Asa.

In one sudden motion, Chris flipped them over so that he was on top, his
shirtless body hovering over Asa's smaller frame, tie tangling down to
brush against the boy's sternum. "My turn," Chris whispered, and leaned
down and began kissing Asa once more. He slowly began moving down, kissing
the boy along the jawline, down the neck and onto his torso. With one hand
on the left nipple, Chris attacked the right one. He licked, sucked, nipped
and tugged on the small areole. Asa's moaning was punctuated by small
squeals of delight, especially when Chris grabbed just the tip between his
teeth and gave a quick tug. Chris swapped sides, and began tormenting the
left nipple while his hands caressed and pinched the now-sensitive right
one. Asa was squirming under the sexual torment Chris was putting him
through, but Chris' strong hands held him in place.

Chris looked up as Asa's beautiful face and kissed him once more, bringing
his hands up to cup the young star's face. His tongue slowly, languidly
entered Asa's mouth and duelled with the boy's own, as he held Asa's face
hard against his own. Chris suddenly broke off the kiss, and with a quick
kiss to the boy's chin, sternum and belly-button, he was kneeling between
the boy's legs at the end of the couch. He looked into Asa's eyes as he
stroked the boy's chest with one hand while rubbing his crotch with the
other.

"I've wanted to see what's hiding in here for a long time," Chris said
seductively.

"I've wanted you for so long too," Asa replied breathlessly.

Chris grinned at that, and grabbed onto the waistband of the trackpants,
and the underwear underneath. Asa helpfully stuck his legs up into the air,
and Chris pulled the last of the boy's clothes off and threw them across
the room. Revealed was Asa's hard cock, about six inches long with a decent
girth. Chris grabbed it in one hand and began stroking it, while his other
hand started stroking the outside of Asa's thigh.

"It's bigger than I imagined it would be," Chris said as he leaned down and
gave the head a quick lick. It was a dark purple colour, and felt rock
hard. "I certainly don't mind, though," he teased.

"Please Chris, keep going," Asa replied, his breathing shallow as Chris'
strong hands stroked his rock hard cock. Chris happily obliged, and leant
down and took the head in his mouth. With one hand continuing to stroke the
length of Asa's cock, and his other hand running gently up and down the
boy's side, from the bottom of his ribs to his knee, Chris suckled the
head, soaking it in spit, running his tongue around it while inside his
mouth before slowly pulling off, sucking it in slowly again. His tongue
occasionally flicked across the slit as it re-entered his mouth, and he
felt shivers rush through the boy's body as he did this. Asa's legs were
attempting to squirm, but with Chris planted between them they couldn't
move very far, and Chris' spare hand kept at least one under control.

Changing tack, Chris brought his hand down to the root of Asa's cock, and
holding the base between thumb and forefinger, allowed the other digits to
begin fondling his balls. Surprisingly, they were quite small, and were
tucked snug under the base of his cock. At the same time, Chris leaned
forward and took the full length of the cock into his mouth, and with a
loud gurgle brought his lips down to contact his fingers. His nose landed
amongst the short, black pubes surrounding the boy's groin. Asa, who had
been unable to make a sound up to this point, let out a small moan as his
back arched, pushing himself deeper into Chris. Chris moved his roaming
hand from the side around to the boy's raised bum, and grabbed the bun
tightly. Using his new handhold, Chris ground the boy's body in a small
circular motion into his face, making the boy's cock move slightly within
Chris' mouth.

Chris had long ago learned how to breathe with a cock rammed down his
throat, and was enjoying the feeling of his throat being stretched by Asa's
thickset meat. His tongue was still able to move a little, and he used it
to stroke the length of engulfed member. Pulling his other hand out from
between Asa's legs, Chris took a bun in each hand and let Asa's hips move
away from his face, keeping his lips wrapped tight around the throbbing
member. As the back of his hands touched the sofa, his lips were wrapped
around the base of the head. In one sudden motion he rammed the cock back
into his mouth, forcing the cock up into his throat. Chris was now face
fucking himself with Asa's cock, keeping his head steady as his hands moved
the boy's hips at lightning speed. After a time he slowed his pace,
twisting his head as the cock moved in and out to further sensualise the
boy. Chris gently laid the boy's hips back down onto the sofa, and allowed
both to begin roaming his chest and legs as he continued his assault on the
member. Looking up, Chris could see Asa's eyes were glued to him, watching
him suck on his cock. Chris stuck his tongue out and licked the cock from
base to tip, staring into Asa's eyes with an enormous grin on his face.

With a final pass over the slit, Chris seductively asked Asa, "Did you
enjoy that?"

"More than you could imagine," Asa replied, air heaving from his lungs. He
leant forward and, with a hand under Chris' chin, pulled the older man into
another passionate kiss. He pulled away and whispered into Chris' ear, "I'm
kinda hoping your' is bigger than mine," with a big grin on his face.

Chris whispered back, "Maybe just a little," and with a big grin on his own
face, leaned back into the corner of the sofa and stretched his legs out
and around Asa, who was still kneeling in place and watching Chris'
shirtless body. He leaped forward and attacked, his hands grabbing the
sides of Chris' ripped body as he worshipped the slabs of pectoral muscle
before him. Massaging the girth of his musles from the sides, he kissed all
over the muscles, and ran his tongue around the defined creases and
crevices on the Adonis. He could feel Chris' hands stroking and mussing his
hair, and rubbing his back and sides as he did this. Moving lower, he made
love to each ab in turn, licking and kissing each in turn as he dragged his
tongue across the spaces between them. He reached the smooth area just
below Chris' belly button and quickly undid the belt and pants. Chris stood
up at this point, and Asa, watching hungrily, stared as Chris removed the
last of his clothes. Asa could hardly believe his eyes at the sight before
him – Chris' big cock was hanging straight out in front of him, nine
inches long and as thick as a cucumber. Asa could only stare as Chris took
the big piece of meat in his hand and gave it a quick stroke. An obscene
amount of precum oozed forth as he did this, and unable to contain himself
any longer, Asa leaned forward and took the head of Chris' cock into his
mouth.

What could only be described as sweet nectar flowed into Asa's mouth. The
head of Chris' cock was coated in a layer of delicious precum, and Asa
sucked greedily as Chris continued to spew forth more.

"Oh boy, you're making me so wet," Chris moaned, his voice heavy and thick
with lust. One had was on his back, supporting him as he leaned back and
pushed his hips forward, while the other continued to ruffle the boy's
hair. Getting the idea, Asa moved his hands onto Chris' smooth ass cheeks,
and began moving up and down on Chris' cock. Asa had sucked a few cocks
before, but never one so large, nor attached to anyone as hot as this. His
body moved of its own accord, pressing hard against Chris' big strong
thighs as his hands roamed up and down their length. He took as much of the
cock as he was able to, a little over a half of the length, before his gag
reflex kicked in and stopped it fast. Quickly suckling what length he
could, Asa began moving fast, his head bobbing back and forth down the
length of Chris' tool. He pulled off, and licked the underside of the cock,
tracking along the piss tube.

Bringing both hands round, he placed one at the base and began stroking,
while the other hand, using the foreskin made slack by the stroking, worked
the skin over and around the swollen head. Turning his head, Asa pressed
lower and into Chris' scrotum. Each of Chris' balls was about the size of a
chicken egg, and Asa suckled and kissed each in turn. Chris was enjoying
this new treatment, and spread his legs wide to give the boy as much space
as he needed. Coming back around, Asa held the top of Chris' cock with the
flat of his hand while his tongue pressed up and along its length, then
swallowing the head once more. Quickly polishing the head clean, Asa made
to move deeper when Chris interrupted.

"Asa," Chris whispered. Asa looked up, the head of Chris' dick still in his
mouth. "How would you like to try going a bit deeper?"

Asa let go of Chris' cock and asked, "Do you know some dirty, slutty
tricks?"

"Mmmm-hmmmm,' Chris replied. He grabbed Asa by the waist and lifted him off
the sofa. Chris flipped him around and plonked him back down, except now he
was lying on his back, head dangling off the edge of the sofa and his feet
up in the air. "Now just open wide and breathe through your mouth. Focus on
keeping your throat relaxed, and you'll enjoy it," Chris reassured him. He
was really looking forward to this; the boy's throat would be so tight
wrapped around his cock. Asa did as he was asked, and made a show of
breathing noisily through his gaping mouth. Chris grabbed onto the back of
the couch and brought his cock down into Asa's open mouth. Pressing gently,
he pushed it in deeper and deeper. Hitting something solid, he paused, but
maintained the pressure on the back of the throat.

"Now just breathe out your mouth, gently, don't panic," Chris calmly
repeated, and moved one of his hands across to stroke Asa's dangling
foot. He could feel Asa's throat relax and his gentle pressure moved him
deeper. About a half inch in, he felt Asa's throat spasm and he pulled
back.

"It's ok, that was excellent," Chris was grinning, and so was Asa. He was
so poud of being able to take at least a little more of Chris' mighty tool.

"Keep going," Asa enthusiastically opened wide once more and focused on his
breathing. Chris moved in, pressing his cock to the back of Asa's throat
more firmly now. On the fourth stroke, he leant in harder and felt himself
enter Asa's throat. He pressed deep, getting a few inches down, Asa's lips
almost reaching the base of his cock. He pulled back, and felt the sudden
rush of thick saliva surround his cock and ooze onto his balls. Chris loved
getting deep throated, and the ensuing slime it coated his nether regions
in.

"Ugh, *cough* *splutter*, umm, sorry," Asa could barely breathe for all the
gunk in his mouth. He was incredibly embarrassed.

"Mmmmm boy, all that slime is perfectly natural. I love it," Chris replied
hungrily, as he leant down and kissed Asa's face, sucking up some of the
slime before kissing him deeply and feeling more of it swirling around his
mouth. "Ready for some more?" Chris asked as he stood up again.

"Absolutely!" Asa replied.

"Just let that slime ooze out your mouth, don't hold back," Chris told him,
before leaning in and pressing deep with his cock. He began working his
cock in and out of Asa's wide-open mouth, his cock only entering the boy's
throat a little each time, getting it used to the feeling of being
assaulted. Without warning, he plunged deeper, allowing almost his entire
cock to enter Asa's mouth. The boy's eyes went wide but, with incredible
focus, held off gagging and luxuriated in the taut feeling of Chris' cock
deep inside him. Chris paused for a moment before pulling back out,
bringing a fresh load of slime out with him. Using the tip of his cock, he
smeared it across Asa's face before demanding, "Suck it clean."

Asa did as he was told, cleaning his slime from the engorged cock
head. "Open wide," Chris again demanded, and Asa complied. This time Chris
entered Asa with a gusto, moving fast and plunging in and out of his
throat. He occasionally plunged deeper, and each time pressed himself
deeper into Asa's throat. Asa would occasionally squirm, and Chris would
move out, letting the boy catch his breath and clear some excess spit
before re-entering him. By the fifth such plunge, Chris was pressing Asa's
chin deep into his own stubbly brown pubes, his balls slapping against
Asa's slimy nose and eyelids.

Asa was in a sexual haze, unable to see anything but the enormous cock
entering his young throat. He began wanking himself unconsciously, and
could feel himself getting close. Chris had not noticed until Asa was
squirming beneath him, and he looked down and saw what the boy was
doing. Continuing his assault, but not going as deep, he watched as the boy
brought himself to completion.

He started whispering, "You like my big cock? You gonna cum for me, boy?
Cum for me, pretty boy, take my cock." These words were too much for Asa,
who let forth a torrent of cum. Chris, who had been waiting eagerly for
this moment, leaned down and took the head of Asa's spewing cock into his
mouth just before he started cumming. Not a drop of Asa's surprisingly big
load left Chris' throat as he guzzled the entire load. As Asa wound down,
Chris let go of the head, and grabbed hold of the shaft, gently working
every last drop out and collecting it on the tip of his tongue. With a
small amount of the semen still in his mouth, he carefully turned the boy
around so he was lying on the sofa normally before climbing on top of him
and kissing him deeply, smearing his semen around the inside of his own
mouth, mixing it in with the thick saliva also present. Chris leaned back
and stroked Asa's hair off his forehead, hair that had been plastered down
by quantities of spit.

Chris grinned before leaning forward and, using his tongue, cleaned the
thick gobules of saliva off the boy's face. One hand reached down between
his legs and began stroking his hard cock as he did this.

Asa whispered, "Let me," bringing his hands up to contact with Chris'
cock. Taking the base and balls in one hand and the foreskin just below the
head in the other, Asa quickly began stroking Chris' cock and fondling his
egg sized balls. Chris began moaning breathlessly, sitting upright, hips
floating above Asa's bare stomach, giving the boy a full view of his
god-like body. Asa leaned forward and let the tip of his tongue rest on the
tip of Chris' cock, moving it around slowly as he continued to wank
furiously. Chris was getting close, and he shuffled a little closer to
Asa's head, pressing the head back into Asa's mouth. A sudden grunt was the
only warning before volleys of spunk shot out from his cannon, the first
few shots going straight in Asa's mouth, almost drowning him before
painting his face and neck white. Asa continued stroking, forcefully but
slowly, bringing every last drop out and catching these in his open mouth.

Chris looked down, his enormous pectoral muscles heaving, swelling as he
tried to regain his breath. He leant forward and rested his hands on the
armrest behind Asa's head; Asa meanwhile was appreciating the muscle show
before him, staring as the muscles swelled and clenched as Chris regained
his breath. Asa let one hand stroke the side of Chris' body, and was
rewarded with a breathless shudder from him.

"Wow," Chris exhaled deeply, feeling more normal. He looked down and saw
the new paint job on the boy's face, before grinning and saying, "I'm gonna
have to clean that up now." He wiped his index finger across the boy's
face, collecting quantities of semen off it before feeding them to the
hungry Asa. Asa sucked hard on the digit as it was placed in his mouth,
collecting all the juices off it. Chris grabbed the last of it off with his
tongue, and bent down for a deep, semen-swapping kiss.

"Mmmm, that was good, boy," Chris hoarsely informed him, before tucking his
meaty arms under Asa's body. He stood up, wrapping his arms around Asa's
middle as the boy's legs wrapped themselves around his waist. They resumed
kissing, their tongues swirling around one another. Chris pulled away and
stared into Asa's eyes, and whispered, "Which way to the bedroom?"



Comments, questions welcome – faker11235@hotmail.com

If you like this story, try reading some of my others:

http://www.nifty.org/nifty/gay/celebrity/justins-indulgence/
http://www.nifty.org/nifty/gay/celebrity/zacs-debut