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Stiles sighed contentedly as he slowly woke up. There was a warm body plastered against his back. Derek pressed a sleepy kiss to the back of his neck and slowly rocked his hips against Stiles’ butt in response.
“‘Morning,” he murmured, mostly to his pillow but he knew Derek would hear him.
“Good morning,” Derek answered and tightened his arms around him, pulling Stiles back against him.
Stiles moaned happily when the movement caused Derek’s half hard cock to slip between his thighs.
“Oh, good morning indeed,” Derek laughed, voice rough from sleep. “God, Stiles. You’re so fucking wet already.”
Derek kept rocking forward and Stiles moaned as Derek’s cock kept sliding against his cunt. Suddenly Derek stilled.
“What’s wrong?” Stiles asked. His eyes shot open but his room was empty. He checked the doorway and the window. His dad had not mysteriously appeared in his door and neither had one of the pack crawled through his window.
“Derek?” Stiles asked, confused and scared. If Derek went still like this it was never a good sign.
“You’re hurt,” Derek finally said.
“What?” Stiles frowned. He quickly mentally checked his body. He felt fine, nothing hurt. Okay, his back was a little sore but that was absolutely normal and 100% to blame on Beacon High’s shitty classroom chairs.
“I feel fine,” Stiles shrugged.
“You smell like blood,” Derek told him and carefully turned him over in his arms and started running his hands over Stiles’ body.
Stiles inconspicuously crossed his arms across his chest. He wasn’t wearing a binder and while he didn’t mind sleeping next to Derek without one and even fooling around sleepily in the morning, if Derek was going to poke and sniff his body he didn’t want him anywhere near his chest.
But Derek froze again as soon as he lifted the blanket.
“Fuck,” he breathed, “Fuck, Stiles. I hurt you.”
The horror and regret was more than obvious on Derek’s face and Stiles had no idea what he was talking about he felt fine, he wasn’t in any pain and if Derek was freaking out about some silly small scratch Stiles would be grumpy about the interrupted sex.
He reached a careful hand between his legs where Derek’s gaze had frozen. His fingers encountered sticky wetness between his thighs and with a defeated sigh he looked down at his now stained red fingertips.
“Oh, great,” Stiles grumbled.
“Do I call an ambulance?” Derek asked and Stiles wasn’t sure if he wanted to laugh hysterically or cry.
“No, Derek, you don’t need to call an ambulance. I’m fine.”
“You’re bleeding, Stiles! And not just a little bit,” Derek still seemed shocked. And Stiles really appreciated him being worried and maybe also the fact that Derek saw him as enough of a guy that he hadn’t immediately made the connection.
“I’m on my period,” Stiles sighed.
“But you’ve never… I didn’t know you…,” Derek stammered.
“Yeah, sometimes my body decides it hates me enough that all the testosterone in the world isn’t enough for it to not make me bleed,” Stiles grumbled. He really did not want to be dealing with this. “I’m gonna shower and shove a tampon up there,” he rolled over and made to leave the bed.
Derek held him firmly in place and once again gave him a thorough sniffing.
“Seriously, dude? Blood is coming out of my vagina, there’s not a lot of reasons for that,” Stiles complained. “You didn’t hurt me, Der’.”
Derek only nodded.
“I know, it smells like period blood now that I know it. My brain is still a little confused though, you still smell completely like boy.”
“Well, I still am a boy, just one who happens to have gotten his period and who is going to suffer cramps for the next few days. Fun.”
Derek dragged his eyes up and down his body.
“Sex helps against cramps,” he suggested with a light blush to his face.
Stiles grinned.
“I like how you think,” he pressed a kiss to Derek’s lips. “Now let me take a quick shower, do something to stop this mess and then we can talk about you blowing me.”
Derek still held him in place.
“Umm, you don’t have to. I mean, I wouldn't mind if you didn’t.”
There was a definite blush to Derek’s face now.
“You want me to uhh…? Not put a tampon in or not shower?” Stiles asked. He tried to imagine Derek just going down on him like this. His upper legs were stained with dried blood, so were his pubes. He knew his dick and hole would be wet with it.
The arousal that shot through him was entirely unexpected. Derek’s nostrils flared as he clearly picked up on it. So Stiles decided to just go for it and slowly spread his legs. The arousal visibly darkened Derek’s eyes as he tracked the movement and the scent too.
Then he settled himself between Stiles’ legs, his movements were slow and deliberate as if to give Stiles all the time in the world to change his mind or back out. Stiles didn’t. He brought his hand to Derek’s face and helped guide him down between his legs.
The first kiss against the inside of his thigh was almost a shock. Derek was slow and gentle as he licked the skin and cleaned the blood off. When he was done he moved to the other leg, giving it the same treatment.
Then he moved up, almost in slow motion. Stiles kept his hands tangled in Derek’s hair, guiding him, reassuring him that he wanted this.
Derek stopped hovering merely a few millimeters away, he was breathing in deep breaths of Stiles’ scent, of the scent of the blood between his legs.
“You’re totally into this, aren’t you?” Stiles snorted and then laughed at the pink blush spreading over Derek’s face and ears. He gave Derek’s head a little nudge and gasped as Derek finally took his dick into his mouth, gently sucking the sensitive nub between his lips and running his tongue over it.
“Fuck,” Stiles breathed and arched his back.
“Can I?” Derek asked and slid a curious finger down between the folds of Stiles’ opening.
“Yeah,” Stiles nodded and spread his legs wider. He felt the wetness drip out of him, then Derek’s tongue as he chased it. “Fucking hell.”
Derek’s tongue pressed into him easily and Stiles rocked forward into his mouth. Derek’s tongue went back to his dick as his fingers replaced his tongue inside him. With practiced moves he found just the right place to press to make Stiles shout and arch off the bed.
The shudder of his orgasm shot through Stiles, his fingers twisted tightly into Derek’s hair as he pressed forward into his mouth. Finally he shoved him off after the last of the aftershocks had shivered through him and Derek had finished languorously licking him clean.
When Stiles pulled him up there were red streaks on his lips and his chin and a very satisfied smile on his face.