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Derek glared down from the tree branch he had been sleeping in, annoyed at having been woken in the middle of his daily nap. He wondered how he'd been found when he was hiding his scent with one of Deaton and Stiles concoctions, some spritz that could erase scent and hide them from other wolves in case of an emergency.
He'd used it more than once after having his ass gaped by his beta's so Scott couldn't be an annoying little snich and tell Stiles of Derek's cheating ways. The alphas cock twitched in his jeans when he remembered the pounding he'd take from Boyd the night before while Isaac and Jackson used his mouth pussy.
He held back a groan as Boyd and Stiles walked past his tree. He glanced down and noticed when his beta looked up at him then down at his boyfriend who was jabbering on about how thankful he was to Boyd for his help at the gym or something. Derek wasn't really paying attention, too busy watching the way Boyd adjusted his substantial bulge in his jeans. Stiles noticed too and paused in their walking.
"What, did talking about the gym get you all horned up?"
Derek frowned at his boyfriend while Boyd grinned slightly down at the shorter male.
"Yeah. You were so good when you were down on your knees. I hate listening to you talk but I love hearing the sounds you make around my dick, little man."
Stiles scoffed with a large grin and pressed into Boyd, moving till they were up against a tree.
"Yeah? Did you love my fingers up ass too big guy?"
Boyd licked his lips, a contemplative look on his face. Boyd knew that Derek was the top in his relationship with Stiles but a total cockslut for everyone else. He wondered why his alpha hadn't let Stiles into his cunt yet, the kid had a huge dick.
Boyd pulled Stiles up against him so he they could feel each other's bulges rub into each other. Erica would probably gut him for getting do to this before her. She might also gut him if he didn't take the opportunity.
"Yeah, I did actually. Was wondering what it that tongue of yours would feel like in my ass though."
Boyd heard his alpha growl but didn't pay him any mind. If the bitch wanted to interrupted, Boyd could just bend him over a nearby trees stump in front of his boyfriend.
"Get those jeans off and turn around then."
"You first, pretty boy."
They exchanged challenging grins. Boyd would never admit it but he enjoyed these pissing contests they had. After Stiles eventually realized that Boyd (probably) wasn't gonna punch a hole in his chest they'd had an easy friendship develop between them, mostly consisting little games and good sportsmanship.
They both got undressed and Boyd lied down on their clothes, his neck and upper back rested up against a tree so he could look up into the branches and watch his alpha seeth. (He'd probably gotten that from Erica. And maybe Jackson, those two were ballsy as fuck when they wanted to be.)
Stiles kneeled down in front of Boyd so he could kiss the beta's huge cock, mouthing down his length to his balls, popping one then the other of those ebony orbs into his mouth. He licked back up to the mushroom head of the Boyd's cut cock, pretty lips wrapping around the shaft and taking him down to the root, not stopping until he felt his lips pressing up against a saliva coated ball sac.
Boyd looked at him with hooded eyes as he pulled off and moved his head down between his thighs, propping dark, hairy legs over his shoulders as he spread the wolfs asscheeks with both hands. He kissed the twitching hole and closed his eyes in pleasure as he lapped at Boyds tasty insides, not hearing his boyfriend drop from his perch and moving closer to stand behind a nearby tree.
Boyd grinned lazily as let out contented little gasps and sighs when Stiles' tongue swirled inside his ass.
He bit his lip and stroked his cock, teasing the slut with what he couldn't have right now.
Derek was furious as he watched his boyfriend make out with his beta's ass.
"Yeah, you love that don't you? Bet Derek doesn't let you do this does he?"
Stiles pulled off where he was sucking Boyds ass with a slurp.
"Nah dude. He doesn't even let me finger him and I'm not an asshole so I'm not gonna push him to do something he doesn't wanna. Besides, he's really good at using that big dick of his and I get to fuck all his little beta's. Speaking of, you wouldn't mind if I tried using my pretty boy tongue on your girlfriend would you."
Boyd chuckled, almost wanting to ask the boy the same thing and barely resisting.
"Knock yourself out little man. But you're gonna have to fuck me first. Can't have you giving my girl subpar orgasm now can I?"
Stiles grinned as he swirled a finger around Boyds anus, moving up the man's body so he could make out with him. He moved the man's hand off his cock so he could stroke the length himself, enjoying being able to make the stoic man moan into his mouth.
He kissed down the man's neck and asked, "You ever done this before? You ever get fucked up the ass?"
Boyd laughed at the question. "I've only ever dated Erica."
Stiles pulled back to cool an eyebrow at him.
"So is that a 'yes' or..."
Boyd rolled his eyes.
"It's a kind of. She loves to rim me and use her fingers but I've never really wanted anything bigger up their before."
Stiles stopped stretching Boyds ass and moved so he could slap his massive dong against the wolfs dark thigh, pressing the head into his balls as though he was fucking them.
"So is this too big then? Don't wanna hurt you or anything."
Boyd scoffed as he heard his alpha break the bark on the tree he was holding onto.
"Nah, just go right ahead."
Boyd paused for a second before grinning.
"Fuck my slutty pussy, please!"
Stiles and Boyd laughed together, the younger slipping inside and shoving all the way as the breath left the beta.
Derek was red in embarrassment as he remembered saying thos exact words to Boyd the first time they'd fucked around.
"Oh fuck, Stiles! Jesus man, you sure know how to lay pipe!"
Stiles fucked hard and fast as the beta wrapped his legs around Stiles' waist.
"Yeah? You like that, you little slut?"
Boyd grunted as he felt the younger boy stretch out his guts.
"Yeah little man, love the way you're stroking my insides. Feels like you're in my stomach."
Stiles laughed as much as he could with all his breath being used to groan.
"Yeah?"
He placed his hand on Boyds rock hard abs (harder than Derek's, he noticed, with a slightly bigger dick too), fucking even faster and he felt it.
"Holy shit dude! I can feel cock everytime I fuck inside! Im literally in your stomach Jesus Christ!"
Boyd groaned as he swatted Stiles hand aside to feel for himself and sure enough, on every inward thrust a small bulge bumped into his lower abdomen.
Stiles pulled Boyds legs from his waist and pushed them over his shoulders again, only this time he bent the older man in half and pounded his dick between dark twin moons into Boyds perfect insides.
"I'm gonna cum, oh fuck!"
Boyds mouth fell open as he felt Stiles cum inside him, the boys hand bringing them to orgasm together.
They lie there for a few minutes waiting out their orgasms, Stiles playing with the knot Boyd didn't know he'd popped, squeezing and milking the sensitive flesh.
"Fuck man, that was insane."
Boyd rolled his eyes with a smirk. And replied with a joking tone, "Yeah, Stiles, I can't believe how good it feels to have you filling my guts. Feels like I'm pregnant, all filled up with your cubs."
They kissed with grin, one not noticing and the other ignoring the angry growl that stalked off to sulk in some tree or on some cock or something. Boyd didn't really give a shit either way, and Stiles would (probably) never know.