Chapter Text
Stiles didn’t know what to do when Derek invited Isaac into the bedroom. The scent of sex hung thick in the air and they were both still fairly sticky. He knew they’d been loud enough for the others to hear, but Derek had practically been performing for Isaac’s benefit. Fuck, that’s why Isaac had knocked on Derek’s door. He’d been invited long before Derek had said the words. Stiles’s stomach suddenly clenched with nerves.
But judging by Isaac’s nervous expression as he stepped in and closed the door, Stiles hadn’t been set up. This hadn’t been an elaborate scene concocted by Derek or Isaac to coax Stiles into wanting a threesome. Isaac didn’t know what to do. He’d just been called, that’s all. He stood by the door and crossed his hands in front of himself. He wore a t-shirt and boxers, nothing else.
He was hard, Stiles realized suddenly. Okay, who wouldn’t be, but—this was a little weird. A pang of sympathy shot through him. “It’s okay,” he found himself saying. Isaac’s gaze shot to him.
Derek turned his head on the pillow to look at Stiles, then back at Isaac. “Come on up.” He wiggled a little to make room. Stiles followed his lead, shifting over, but shot a glance at Derek. Now what?
Derek’s expression revealed nothing, but his gaze was warm as he met Stiles’s eyes.
Isaac came to the edge of the bed and climbed up, clearly aiming for a nonexistent spot between Derek and Stiles. They moved again, making more room, and Isaac flopped down on top of the covers. He made a little sound and wriggled as if uncomfortable. Derek tugged at the covers disgustedly. Stiles brought his feet up and helped kick them down—being burrito’d wasn’t the most comfortable, but with the covers off Isaac was suddenly the most dressed of the three of them.
Derek scooted up behind Isaac and curled around him. He rested a hand on Isaac’s hip, fingers under the edge of his shirt. His hand on Isaac looked possessive and calming at the same time. Isaac seemed to unwind.
“Can I…” Isaac murmured.
Stiles looked at Isaac, who was watching him hopefully. He nodded, unsure of what was being asked. It immediately became apparent when Isaac curled a hand around Stiles’s neck and pulled him into a gentle kiss.
Stiles didn’t pull away, but he did freeze and try to look at Derek out of the corner of his eye. There was no protest from behind Isaac. Isaac licked into his mouth and kissed him again, deeper. Stiles kissed back automatically, and Isaac hitched himself closer. Stiles felt Isaac’s erection against his hip, shrouded by his boxers. Isaac ground his hips a little and whimpered.
“This is all your call, Stiles,” Derek said.
Stiles broke free to breathe. Isaac dropped his hand, expression going bleak.
“No, it’s okay.” Stiles petted Isaac’s waist, his hand running into Derek’s. “Just…give me a second.”
Isaac didn’t look convinced. Stiles looked helplessly at Derek.
Derek nodded and executed a neat roll to pull Isaac onto his back and for Derek to loom over him. Derek tugged the hem of his t-shirt. “Off.”
Isaac whipped it off like he was being timed for boot camp. Once he’d broken contact with Stiles, he had never stopped looking at Derek.
Derek kept his eyes open and leaned in for a kiss, biting Isaac’s lower lip first. Isaac whimpered and his mouth dropped open as his eyes slid shut. Derek deepened the kiss, his tongue flashing wet in the light as it pushed into Isaac’s mouth before their lips sealed. Stiles exhaled shakily over a rush of arousal.
Isaac arched up and Derek hooked his fingers in the waistband of his boxers, dragging them down. Isaac had the lean cut of muscles above his hip Stiles had envisioned, hoped for, a pair of arrows leading to a nest of light brown hair. The boxers hid the rest as Isaac dropped his hips and Derek released the waistband to drag his fingers up Isaac’s stomach. A trail of light scratches appeared and disappeared in his wake, vanishing like magic. Isaac moaned throatily as Derek scratched up to his pecs and around his nipples, small and pink and stiff against his creamy white skin.
Stiles hooked his finger in the boxers and tugged. Isaac’s hips came up automatically, and Stiles worked the waistband under his erect cock and balls before pulling them completely off.
Derek broke out of a kiss with a growl and buried his face in Isaac’s throat. His jaw worked as he bit and sucked under Isaac’s ear. Isaac’s hips jerked needily, his cock bobbing in the air. It was on the thin side, but long and with a relatively wide head, and flushed dark red with blood. Stiles wanted to touch it.
Derek lifted his head and looked over at Stiles as if cued. Stiles licked his lips and nodded, then cupped Isaac’s cock in one hand. Isaac’s hips jerked again and he whined wordlessly. Stiles glanced at him. Isaac’s eyes were mostly shut, a glimmer of iris between his lashes. Stiles gave him what he hoped was a reassuring smile, and lowered his head to take Isaac’s cock into his mouth.
He was werewolf-hot, silky-hard and throbbing under Stiles’s palm. Stiles worked his lips down the shaft to wet the skin, tongue lashing the underside as he pulled back up. Isaac moaned brokenly and his thighs tensed as he struggled not to thrust his hips up again. Christ, that was hot. Stiles’s attack of nerves quickly faded and he focused on the blowjob.
“Ohhh fu— fuck Stiles, I’m—I’m not gonna last,” Isaac moaned brokenly.
“Did we get you too riled up?” Derek murmured throatily, mouth pressed against his collarbone. “Maybe we should make this quick.”
“No, no—please…”
Stiles licked up to the head of Isaac’s cock and swirled his tongue around it, smiling a little as he heard Isaac choke as his leg and ass muscles vibrated from withheld tension. Stiles tasted a rush of pre-come and licked one more time, then lifted off to give Isaac a break. Derek caught his eye as he straightened, and Stiles smiled as the last of his own tension slid away.
Derek groped across the sheets for the lube, then looked between the bottle, himself, Isaac, and Stiles.
“Eeny meenie,” Stiles said.
“I don’t care,” Isaac said breathlessly, looking between the other two. “Someone just fuck me.”
Derek growled a little at that, and Stiles grinned. “Derek, then.”
The growl cut off. Derek looked at him carefully, measuring, and Stiles nodded.
Derek didn’t hesitate further. He squirted some lube onto his fingers and reached between himself and Isaac, nodding at Stiles to go back to the blowjob. Just as Stiles lowered his head, Isaac’s hips jerked and he whimpered. Stiles glimpsed Derek’s hand moving behind Isaac’s balls, inches from Stiles’s nose. He imagined what it would feel like to be penetrated and have one’s dick sucked at the same time, and groaned to himself before taking Isaac back into his mouth. The cloud of lust falling over his brain made it easy to stop thinking about relationship implications and all that interpersonal pack stuff. His focus narrowed to the smooth glide of the cock in his mouth, the taste of skin and pre-come, the smell of rich masculine arousal and the groans in his ears.
Still, Isaac made Stiles stop a few more times while Derek fingered him, sliding one finger at a time into Isaac’s ass and thrusting them slowly to stretch him out. Stiles rested his head on Isaac’s thigh and watched him squeeze his own cock to fight off an orgasm, teeth clenched and neck exposed, a long pale line in the low light. Derek didn’t stop fingering him, using more lube and adding another finger, his face a mask of intense arousal and focus. Finally Derek pulled back and wiped excess lube onto the sheet, then knelt up and gestured at Isaac. Derek’s cock was fully erect, pointing straight up and tapping against his abdomen. Stiles’s mouth started watering at the sight.
Isaac took the cue and flipped completely onto his stomach, then pushed back onto all fours. Derek knelt between Isaac’s legs and looked at Stiles. Initially Stiles thought he was asking for permission again, and he nodded emphatically. Then he realized Derek was trying to cue him to move, too, with a little tilt of the head. What? Go back to blowing Isaac? Let Isaac blow him? Sixty-nine?
“Stiles, please—” Isaac had buried his face in his arms, and rolled his head to peek out. “Can’t wait.”
Fuck it, if Derek couldn’t elaborate with his head shake language, Stiles would do whatever he wanted. He lay down on his back and scooted under Isaac, positioning his head under Isaac’s hips. Isaac lifted up onto his hands to accommodate him, but Stiles wasn’t focused on getting his dick sucked. This was Isaac’s turn.
Even before Stiles could take him into his mouth, Derek lined up his cock and started pushing into Isaac’s ass. From his vantage point Stiles could see anything, and holy fuck that was hot. Isaac groaned wordlessly, hips twitching as if he couldn’t decide whether to pull away or push back for more. Derek rubbed his thumb around Isaac’s stretched hole and massaged the muscles of his ass, trying to make it easier. From the sound of things, Isaac didn’t mind at all.
Stiles waited until Derek was fully seated inside Isaac, which took several minutes, then took Isaac’s cock in hand and guided it into his mouth. Isaac moaned and his hips twitched hard, pushing instinctively into the back of Stiles’s mouth. Stiles fought back a gag and swallowed, feeling Isaac bump the base of his tongue. God, he was so deep. Stiles pulled his head back and wrapped his fingers around the base of Isaac’s cock, jacking him while Stiles sucked on just the tip. Derek started thrusting, slow and careful of Stiles’s position.
Eventually Stiles got tired and Derek couldn’t hold back. Stiles moved back a little until his face was under Isaac’s ribcage. He focused on the skin he could reach, kissing and stroking his chest, tonguing and biting and flicking his nipples. Isaac never stopped groaning, pressing down for Stiles’s mouth and back for Derek’s cock, his body shaking as Derek started slamming into him.
A snarl broke out of Derek’s throat. “Stiles, MOVE.” Stiles scrambled out from under Isaac without asking why, and he quickly figured it out. Derek somehow started fucking Isaac harder, hips jack-rabbiting into him, pressing his face and shoulders to the bed and leaning over him. Isaac still groaned continuously, burying his face in the mattress and taking everything Derek gave him. Finally Derek snarled again and clamped his teeth in the round, bunched muscles of Isaac’s shoulder, right next to his neck. He slowed, thrust shallowly a few more times, then stopped.
The only sound in the room was panting breaths. Stiles realized he was one of them, and closed his mouth and swallowed. Fuck, he was hard again, rock-hard. He wondered if Derek could go again.
Isaac’s arm moved, sliding his hand under his body and between his legs. Stiles moved but Derek got there first, dragging Isaac’s hand back out and pinning it to the bed. He straightened to a kneeling position. “Not yet. When I say.”
There was a dark bite mark on Isaac’s shoulder, but Derek hadn’t broken the skin. Still, Stiles knew from experience that on a normal person it would bruise like hell and hurt for days. Isaac had the werewolf healing thing going for him, but a mark like that from his Alpha would still take a few hours to fade.
Derek pulled out quickly, and from Isaac’s full-body twitch Stiles knew Derek had knotted him, and withdrawing like that must have felt intense. Derek flopped over onto his back next to Isaac. His chest heaved as he caught his breath, sweat glimmering in the low light. Isaac stayed in the exact position Derek had left him, and whimpered inquiringly.
Derek looked under Isaac’s chest at Stiles. “What should we do with him?”
Possibilities ran through Stiles’s brain like a porn sampler on 500% speed. “Um.”
Derek smirked.
As hot as Derek’s dirty talk had been, Stiles didn’t really want to get fucked by Isaac. Stiles’s ass belonged to Derek. So as much as Stiles wanted to get fucked again, he was going to have to wait. But he didn’t want to make Isaac wait, either.
He met Derek’s gaze. “Blowjobs. Sixty-nine.”
“Whatever you want,” Isaac said shakily. “Just…quickly.”
Stiles got back into position, although this time he noticed the come dripping out of Isaac’s stretched hole. Christ, his brain was going to melt if he slept with werewolves much more. It was like being on a porn shoot, only without as much jaded cynicism and fluffers waiting in the wings.
Stiles did NOT need a fluffer.
He had barely settled himself when Isaac sucked Stiles’s cock into his mouth, taking him in deep. Stiles heard him gag a little and felt a scrape of teeth as Isaac drew back. Stiles hissed and twitched. “Man, be careful.”
“Don’t make me come over there,” Derek rumbled next to them.
Stiles snorted and took Isaac’s cock in hand, stroking it a few times. Isaac shuddered and swallowed a moan, then tried again with Stiles’s erection. This time he was more careful, and Stiles fell into the rhythm of sucking Isaac off while trying to enjoy his own blowjob. It was a lot to process and focus on. The few times he and Derek had sixty-nine’d, it had taken a really long time for them to come. Good thing Stiles loved sucking Derek’s cock.
Suddenly Isaac’s hips thrust unevenly, jerking movements that messed up Stiles’s rhythm. Isaac pulled off Stiles’s cock and panted, “Close—gonna—Stiles, please—”
Stiles sped up his stroking hand and sucked harder, soon tasting the first spurt of come. He swallowed quickly, and kept swallowing, stroking Isaac through his orgasm. It seemed to last for several minutes until there was no more come, just twitches running through Isaac’s body. Finally Isaac pulled away, and Stiles closed his eyes and rested the back of his sticky hand on his forehead.
Lips touched his and he stirred enough to open his eyes, then smile against Derek’s mouth. Derek licked across his lips and pulled back just far enough to speak. “You’re a good person.” He rubbed his nose against Stiles’s.
“I dunno. A good lay, anyway.”
“Don’t sell yourself short,” Isaac said sleepily from next to them. He pushed himself to sit up and rolled to throw a leg over one of Stiles’s thighs. Resting his head on Stiles’s chest, he wrapped his fingers around Stiles’s unflagging erection.
On Stiles’s other side, Derek scooted down the bed until his head was level with Stiles’s groin. He leaned in and buried his nose at the root of Stiles’s cock, licking around Isaac’s fingers.
“Oh, fuck.” Stiles pumped his hips carefully, not wanting to dislodge either of them. “You guys aren’t…a little faster, Isaac…you’re not exactly disproving my point.”
Isaac dug his teeth warningly into Stiles’s chest, right next to a nipple. “Less talk, more coming.”
Derek reared up and grabbed Isaac by the back of the neck to drag him down to the other side of Stiles’s cock. “We’ll argue this later.”
Stiles pushed his fingers into Isaac’s hair, feeling the curls catch around his knuckles. Isaac rumbled his approval and nosed at the crease between groin and hip, inhaling deeply every few seconds. Derek sucked a hickey into the spot opposite Isaac, watching Stiles with raised eyebrows. Stiles just grinned blissfully and lay back to enjoy the attention.