AN: Bit of a shorter chapter, but I have longer chapter's in store!

Hope you enjoy.

Hiccup broke away reluctantly from Jack, checking the time for the third time in the last 2 minutes.

Jack, annoyed at Hiccup's constant interruptions, impatiently kissed along Hiccup's neck. Hiccup lost himself in the feeling for a few moments, letting out a small sigh at the feeling.

"Jack, we really should go back. We've been away for too long; our friends are going to start wondering."

Jack sucked lightly on Hiccup's collarbone – careful not to leave a mark – uncaring. "Let them wonder." He mumbled against Hiccup, the tip of his tongue sliding out to lick up the side of Hiccup's neck, in the way he knew drove Hiccup crazy.

Hiccup was about to give in when Jack's phone rang. They would have ignored it, had it not been the ringtone set for Elsa that sounded through the empty classroom.

"Fuck." Jack groaned, fumbling for his phone that was somewhere on the desk beside him. Hiccup moved to get off Jack's lap so he could find his phone easier, but Jack's hand tightening on his hip held Hiccup firmly in place.

Jack quickly found his phone, almost knocking it off the desk in the process, and answered his girlfriend on the last ring.

"Where are you?" Elsa's muffled voice came faintly through Jack's phone. Hiccup was only able to hear her from how close Jack held him.

"Bathroom." Jack answered quickly.

"You've been there for a while. Are you ok? Are you sick?"

"I'm fine, there was just a bit of a wait. I'm almost done, I'll see you in a minute or two."

"Alright, see you in a minute then. Love you!"

Hiccup made a face.

"Love you too." Jack said with a bit of a grimace.

Once again, Hiccup made to get off Jack, figuring that they were done. However, once again, Jack's grip held firm. "Uh uh, we still have a minute, and I'm not quite finished yet."

Hiccup happily gave in with a roll of his eyes.

If Flynn had noticed Hiccup's repeated disappearances over the last two weeks, he'd made no comment. It was something Hiccup had been worried about the first few times Jack had caught him off guard and pulled him off somewhere. Hiccup had shaken that worry off by the end of the first week, and had even started initiated some of the feverish, stolen moments between he and Jack.

From day one of their 'arrangement', Jack had been incredibly eager. Surprisingly so, considering he and Hiccup still had a very tense relationship otherwise. Although perhaps not so surprising, since Hiccup was just as eager. There was a kind of thrill that came with sneaking around all the time, hiding what they were doing from everyone around them. And the hateful, angry sex was just…

Mondays and Fridays had always been Hiccup's favourite, simply because he'd get to see Jamie and Sophie. Now, that went double, since he and Jack were having fun trying to stay quiet after the two Bennett's had gone to bed, doing their best to push the other as far as possible.

They were insatiable.

Hiccup had very briefly wondered if Jack and Elsa were even having sex from how often he and Jack had sex. That was a thought Hiccup immediately pushed away.

The fewer reminders of Elsa and the cheating the better.

Even though Hiccup had accepted that he was a terrible person for what he was doing – and, admittedly, a sick part of him loved how wrong it was – he didn't exactly want the fact at the forefront of his mind.

Hiccup didn't let himself contemplate his place in hell as he sat down with Flynn for lunch. He and Flynn had originally been walking to lunch together, when Hiccup suddenly happened to remember that he needed to borrow a book from the library. Flynn had thought nothing of it, simply shrugging and heading off to lunch alone.

"Sorry, I couldn't find the book. I'll have to check again tomorrow." Hiccup sighed, resting his chin dramatically on his hand.

"You and your books, Hiccup." Flynn teased, shaking his head as if he was deeply saddened by 'Hiccup and his books'.

Hiccup grinned at Flynn in response.

"Fuck, Hiccup." Jack groaned, pulling harshly on Hiccup's hair. He moaned around Jack in response, sending violent shocks through the other boy. "How are you so good with your smart fucking mouth?'

Hiccup looked up from his knees at Jack, a dark glint in his green eyes, taking Jack all the way to the back of his throat in place of a response.

"God- fuck." Jack gasped, his hand tightening. Hiccup fucking loved when Jack did that, even when his scalp tingled for a while after.

Hiccup dug his nails into Jack's thigh – deep enough that Jack would later scold him for leaving marks, even if Jack did admit to finding that very fact incredibly hot.

"Keep this up and I won't last very long." Jack went to pull Hiccup off, who stubbornly took Jack all the way in again. Jack's hips stuttered, shoving further, enough to finally make Hiccup choke for a moment. That made Hiccup pull off, rubbing the back of his hand over his lips and cheek, removing the spit that covered him.

"You look so good on your knees, so messy for me." Jack praised, a rare occurrence but one that always sent heat sparking through Hiccup.

Jack pulled Hiccup up on the bed, crawling over the brunette to kiss him sloppily.

Hiccup felt Jack's slick arousal rub against his abdomen, spreading saliva and precum on his favourite shirt. Hiccup wrapped his legs around Jack's waist, pulling him closer.

"So needy." Jack mumbled against Hiccup's lips, fumbling to take his shirt and pants off, finally freeing Hiccup's erection from its painful confines.

"Just fuck me already." Hiccup demanded, not bothering to deny Jack's claim, reaching a hand down to stroke Jack's cock.

Jack's nostrils flared, and Hiccup smirked up at him.

"Open your mouth, tongue out." Jack growled, and Hiccup obeyed eagerly. Jack spit in his mouth, and Hiccup swallowed immediately. Hiccup never though he'd be into someone spitting in his mouth, but he couldn't deny the thrill it caused.

"Oh, you liked that, did you?" Jack's voice had become dark, smug, and Hiccup could see it in his eyes how much Jack had enjoyed that too. Felt it in the slam of his hips as Jack finally buried himself in Hiccup.

Hiccup had mostly gotten used to the stretch. Craved the way Jack filled him.

Hiccup let out a guttural moan, broken and crackly after the abuse of his throat and his pure desire.

"Such a slut for me." Jack said, slamming deep again, brushing against Hiccup's prostate. Hiccup let out another breathy groan, kissing Jack his agreement, even as he felt shame burn its way through his chest.

Hiccup swallowed uncomfortably, letting the water soothe his throat. Hiccup had practically torn his throat apart over the last hour, and he was beginning to feel the effects of it settling in now that the pleasure had left.

Jack leaned against the kitchen counter, watching Hiccup with an expression he couldn't decipher. Hiccup raised an eyebrow at him over the glass.

"You liked it." He said suddenly.

"What?" Hiccup asked, confused as to what Jack was referring to.

"It. The- well, when I called you a…" Jack trailed off, as if he couldn't bring himself to say it outside the heat of the moment.

"Oh." Hiccup took another sip to avoid needing to elaborate.

"Why did you, um…"

It had never been this awkward post-sex, not since that first drunken hook-up.

"I don't know. I just…something about the way you said it, how…dirty it made me feel…" Hiccup struggled for the words, deeply embarrassed as he felt the shame flare again.

"So, if I…again…you would?"

Hiccup paused and thought for a moment, before a soft smile rose on his face. "Please, actually. I'd uh, like it a lot if you did. As well as the," Hiccup made a vague gesture to his mouth, hoping Jack would get the message, "yeah."

Jack smirked at Hiccup, who shrugged in what he hoped was nonchalance.

Hiccup was going to hit the next person who talked to him. He'd woken up with phantom pains that refused to leave that morning, and it was making him near murderous. He'd debated staying home that day, but he was getting an assessment in history that day, so he had no choice but to come to school.

Flynn saw Hiccup's bad mood and knew immediately what was going on. He wisely fell silently into step beside his best friend, taking Hiccup's bag from his shoulders to lighten the load. Hiccup did his best to smile over at Flynn in thanks, but he was pretty sure it came out looking more like a grimace.

Much to Hiccup's growing displeasure, they ran into Jack in the halls. For once, Flynn attempted to keep walking without talking to him, knowing it would likely end in a bloodbath in Hiccup's current state. Jack, unfortunately, had other ideas.

"Hello Flynn. Hiccy." Jack said, slinging an arm around Flynn's shoulder.

"Don't fucking call me that, asshole." Hiccup scowled.

"Ooh, feisty today, are we?"

Flynn gave Jack a look, begging him to shut up before things went too far. While Jack and Hiccup would normally try to remain civil for his sake, Flynn knew how little his two best friends could stand each other.

Jack didn't seem to get the hint.

"Are you on your period, Hiccy? Aw, poor thing."

"I'll show you a period when you start bleeding from your ass from how far I shove my foot up your ass." Hiccup growled, sneering at the white-haired ass.

Something flashed in Jack's blue eyes, as if he found the comment incredibly ironic. Jack was only spared that exact fate by Elsa joining them.

Hiccup immediately deflated when he saw Elsa kiss his cheek, Jack wrapping an arm securely around her waist.

Whenever Hiccup saw the two being in love, despite Hiccup's willing participation in the cheating and his general enjoyment of the situation, a part of him couldn't help but feel sick. Especially at how ok Jack seemed every time he kissed his girlfriend with the same mouth that-

Hiccup felt himself getting riled up again, so he limped ahead a little, making his way into the classroom, Flynn trailing in behind him.

Jack shoved Hiccup against a locker in the boys' locker room that lunch. It had taken Hiccup longer than normal to reach his locker from the continuous pain, and it seemed Jack had used that chance to corner him for another hasty session.

Hiccup pushed Jack away with a hiss, turning away slightly to discourage a second attempt.

"What's up with you today?" Jack asked, anger seeping into his voice.

"Just go make out with your girlfriend if you're so desperate right now."

Jack scoffed. "What, don't tell me you're feeling bad now. Or what, are you jealous?" Jack spat, arms crossed over his chest now.

"Fuck you, Jack. I'm just not in the mood right now, if it's so hard to believe." Fucking bastard.

"And why not?"

"Because I'm fucking not! Jesus, you annoying shit. Does Elsa not put out enough?"

"Don't you talk about her like that." Jack threatened, taking a small step closer as his eyes darkened.

"Oh, so you have no problems cheating on her with me, but I make a small comment and suddenly that's too much? With how desperate you are for me, what else am I supposed to believe?"

"You fucking prick." Jack was slamming him back against the locker, only this time his fist was raised, and anger was rolling off him.

"Ooh, touch a nerve, did I?" Hiccup leaned up and roughly kissed Jack, knotting his fist in his hair, suddenly in the mood, pain forgotten.

Jack slammed his fist into the locker beside Hiccup's head but kissed him back.

Hiccup's lips were red and swollen when he joined Flynn for lunch. Jack had gotten rougher than usual, biting harshly into Hiccup's lip multiple times once he realised how much Hiccup loved it. Or maybe because of the lingering anger. Or, most likely, a combination of both.

Flynn gave him a weird look but chose not to comment on it.

Hiccup locked eyes with Jack at another table, looking over Elsa's shoulder as she sat on his lap. His cheeks were still slightly flushed, and his eyes were stilled filled with a fury that told Hiccup he'd be paying later that night.

Hiccup's dad wasn't home very often. Hiccup had stopped minding a long time ago. Because of that fact, Jack would come to Hiccup's when he wanted to fuck if Hiccup wasn't already at Jack's.

Hiccup wasn't too surprised when his bedroom door suddenly slammed open, and someone was pressing him into the mattress without a word.

Jack loomed over him, breathing heavily already.

"Elsa puts out plenty, fyi." Jack seethed, grabbing Hiccup's wrists, pinning them above his head.

"Oh, I'm sure she does, whenever you're not with me." Hiccup shot back, a sarcastic lilt to his voice.

"If you'd prefer, I could go fuck her instead right now." Despite his words, Jack made no effort to leave. Even still, Hiccup locked his legs around Jack after a moment to see what Jack would do, holding him firmly in place. "Eager this time, are we? Thought you weren't in the mood for once."

"Guess I changed my mind."

"Hiccup?" Both Hiccup and Jack froze, hearing the front door open downstairs and Flynn call out.

"Fuck. Shit." Hiccup whispered, glancing around his room for a hiding spot for Jack. "Get under the bed!" He hissed, pushing Jack off.

Jack didn't protest, dropping to the ground and squeezing himself under the bed only moments before Flynn entered.

"Flynn? What are you doing here?" Hiccup's voice came out shaky, and Hiccup realised with horror that he was still mostly hard when he shifted to sit up on his bed. Hiccup didn't think Flynn had noticed.

"I just came around to check if you were ok. Have the phantom pains gone away yet?" Flynn asked, sitting down on the edge of Hiccup's bed.

Now that he didn't have Jack distracting him, Hiccup could still feel the lingering pain in his leg. Though significantly dulled since this morning, they were still enough to cause him significant discomfort.

"They were pretty bad around lunch, but they're going down. I'll be fine. I'm used to it, you know."

"I know, but I still hate to see you in pain like that." Flynn admitted, his eyebrows knitted lightly together.

Hiccup sighed in understanding and smiled over at his best friend. "Thank you for worrying, Flynn."

"Of course, Hiccup, always." Flynn smiled back, and pushed off the bed. "Alright, well, I have work in an hour, so I should get home. Call me if you need anything, yeah?"

"I will, yeah."

"Good man."

Flynn was gone almost as quickly as he'd turned up.

Jack waited for the sound of Flynn driving away to roll back out from under the bed. Hiccup avoided looking at him.

"Oh, so that's… I didn't know you got, what is it, phantom pains?" Jack asked, all traces of lust or anger long gone.

"Yeah." Hiccup said as answer. He really didn't want to talk about it, least of all with Jack. "Whatever, doesn't matter. Are we continuing where we left off, or are you a bitch?" Hiccup immediately changed topics the best way he knew how, unable to deal with that new, sympathetic look Jack was giving him.

Jack was back on him immediately.

"Hey Hiccup?" Jamie asked that Friday night.

"Yeah?" Hiccup asked, turning his focus onto the boy.

"Are you and Jack friends now?"

"Huh? What makes you ask that?"

"Well…I dunno, it just seems like you've been staying later than usual once Jack is home? And just thought that maybe it meant you and Jack were finally becoming friends." Jamie shrugged, moving back to the book he had been reading.

Fuck, fuck, fuck. They weren't being careful enough.

"Something like that, I suppose." Hiccup mumbled, more for himself than Jamie.

What did you even call whatever they were?