I am pleasantly surprised by the overall response to this, since a lot of the time making unrelated characters related makes people mad.

But then, who can deny themselves some good ol' Hicretstrid?

-HTTYD-

Being responsible sucked!

Astrid scowled down at the the styrofoam cup in her hand and inwardly cursed it for already being empty. Then she sighed, placed the cup on the ground next to her seat to discard it later, and forced herself to focus on the lecture about user-friendly layouts and designs. This was important; it wasn't long now until the exams, and if she ever wanted to actually work as web designer, then she had to pass.

But gods her body was driving her insane!

For three weeks now, they opted to be more responsible so the people around them wouldn't suspect anything. It seemed to be working, as Astrid hadn't heard any rumours about the boys acting weird again. But it meant that instead of the usual four or sometimes five encounters per week, they were now down to one or two, and that really, truly sucked! Not even her slight slip up with her forgotten pill had been able to simmer down her sex drive, especially as it had only needed for her to take it as soon as she'd reached the dorm and settle for oral on the one day she'd been able to see her brothers until the protection kicked back in. Not a hard punishment, really; watching Eret fuck Hiccup while he went down on her had been amazing. Maybe she could lure one of them to a broom closet or something during lunch break, or...

Oh, don't be ridiculous, she chided herself, biting her lip and deciding to maybe spend her break somewhere where she couldn't bump into them by accident. She'd survived without nearly-daily sex before; she would survive it now, too. Especially as nothing stopped her from going out and scratching that itch with someone else; there certainly were enough guys to choose from. Like that idiot Thuggory she'd slept with once, months ago. The one with whom she'd first imagined to be with the twins, and who seemed to think that a 'No!' was meant as some kind of challenge. Astrid shuddered, and pushed the thought about him aside. Her problem wasn't creeps like that one though. Her problem was that even the one time she'd hooked up with a decent guy, it just hadn't been enough.

Oh, he'd been fine, with a fair amount of foreplay and a nice hard fuck afterwards… but even that hadn't been as satisfying as sex with her brothers, and Astrid couldn't pin down whether it was actually because they were that good or because the thrill of it being them changed things that much.

Shit, what had the lecturer just said? Something about this topic being highly relevant? Damnit! Angrily, she forced every other thought out of her mind and focused on the lecture. Everything else had to wait. To wait until tomorrow when they were all free for the night and most of the following day too. Gods, she couldn't wait…

I'm hungry! Hope you're ready for me. I'll be there in half an hour.

Hiccup stared at the message Astrid had sent him just now, and burst out laughing a moment later. It really was a blessing that he enjoyed cooking so much, or he wondered how his siblings would survive. Eret could cook, but he was lazy and just pouted until Hiccup fed him most of the time, then offered sexual favours as a reward. Hiccup threw a glance around the kitchen; there was a big bowl of salad to go with the pile of grilled chicken and vegetables he'd prepared for tonight, chuckling to himself.

Don't worry, you won't starve.

However, after sending that response he fished a bag of chocolate-coated nuts out of the cupboard and dumped them into a small bowl, placed it on the table in the living room. Better safe than sorry when it came to the Hunter appetite. Especially Astrid... their baby sister brought new meaning to 'hangry'.

It actually took only twenty minutes before the sound of a key was audible. Grinning, Hiccup went to greet Astrid, knowing that it had to be her with Eret still having lectures. It was a bit ridiculous how much he'd missed her, really. Five days since she'd last been here, two since he'd seen her in the cafeteria, but that didn't count. They'd gone months without seeing each other when he and Eret left for university while Astrid was still too young, but then that was before...

"Hey there."

"Hi."

Her voice was a touch breathless - Astrid usually ran up the stairs rather than wait for the lift. Hiccup stood watching as she put off her shoes and the light jacket, admiring her ass as she bent and her lean stomach as she stretched. She was pure perfection. Biting his lip, he tried to think of something else before his eyes focused too much on the shape of her waist and breasts beneath her skin-tight shirt.

"Food's in the kitchen, but I'd advise to keep that for later, I was thinking dinner and a movie. But there are nuts too, and…"

"Shut up."

Astrid cut him off, barely through the doorway before she leapt on him and before Hiccup even knew what happened, she was kissing him hungrily. As usual, it was less enjoying her mouth and more Astrid rendering him unable to think in a matter of minutes, Hiccup gently but firmly pushed backwards toward the sofa. She was all over him a moment later, climbing into his lap, hands tugging at his hair and his belt as her body pressed against his. Hiccup responded eagerly, hands roaming over fabric and skin, cupping the back of her neck and hips to haul her even closer. Gods, he'd missed her.

"So, that kind of hungry, eh?"

He asked when he got a second to breathe, chuckling breathlessly. He should have known... Astrid just threw him a feverish look, her blue eyes burning with desire as she reached for his hand to shove it under her skirt.

"You tell me."

Hiccup moaned when he found her practically dripping wet, her underwear likely ruined before she'd even come in... but this was a chance he wouldn't miss. With a few motions he worked his way beneath said underwear and started playing with her clit, and watching her writhe and curse above him was mesmerizing as he opted to push into her with two long fingers. He shifted his hand a little for a better position and then was able to rub her clit with his thumb, working in sync with every thrust of his fingers. Between his knowing touch and her need it took less than three minutes before Astrid came, cursing and shouting, clenching fiercelyaround his fingers.

"Fuck, I needed that."

Astrid panted, her head resting against his chest for the moment as she all but melted into him. Hiccup chuckled, often amused with how demanding, wanton Astrid became soft, pliant Astrid... at least until she recovered ready for the next round.

"So, was that enough to satisfy your hunger?"

He asked, his clean hand playing with a loose strand of her hair. Gods, he loved her hair so much. Astrid winked, laughed.

"Not even remotely!"

"Eret told me a secret."

Astrid mumbled about ten minutes solid make-out session later, her lips still at Hiccup's neck where a nice bruise was now forming. What with how they couldn't risk letting anything of their relationship show to outsiders, it was a relief to at least spot those marks on their skin across a hallway or when they saw each other out for food every now and then. The only visible reminder they could risk, anonymous to strangers and obvious only to the siblings.

"A secret?" Hiccup asked, making Astrid whimper as he returned the favour. Fuck, she loved it when they bit her "what kind of secret? You already know how I looked at thirteen, and it's no use teasing me about it. I have pictures of you with pigtails!"

Chuckling, Astrid let her hand glide beneath his shirt. No, her hunger wasn't satisfied in the slightest, although the quick orgasm by his hand just now certainly had taken the edge off of it, let her think a little clearer and simply enjoy the feel of him against her. But still she longed for more, ached to be filled and fucked.

"Oh, it's more of a practical thing," she mused, grinding against him where she could feel him hard through their ruined clothes. She leant a little closer until her lips where at his ear, knowing it would make him tingle "he told me that you consider it cheating when someone pinches you here."

Her fingers found his left nipple and pinched him. Not particularly hard, teasing, barely more than a taste but it was already enough to make Hiccup moan and shudder. He bucked beneath her, her hand squeezing to pinch him again as she tried to brace in surprise. The next one was clearly harder, judging by his potent response.

"Oh, f-fuck!"

Hiccup cursed as his whole body jolted. Astrid watched in amazement, her eyes fixed on her brother's handsome face.

Oh he looked always great, but like this, with his features strained by unabashed pleasure? He looked beautiful. There was nothing quite as exquisite to see as somebody so unguarded, open and needy. She pinched him againjust to see his reaction, Hiccup letting out a sound somewhere between a moan and growl as he gripped her by the hips. Before Astrid knew he was moving her she was lying on her back, his weight on top of her pressing her into the by now incredibly familiar cushions of their sofa.

"That's not fighting fair."

He groaned, pushing against her and why were they still wearing so many clothes? Gods, she wanted to feel him inside her now. And her brothers were perfectly aware of how that felt from when they'd tease each other, so they knew what it did to Astrid. And they teased her anyway the bastards. Two could play that game.

Or three, sometimes...

"Can't wait to see how you react when I suck on them. How about we try while you fuck me?"

She teased, hoping that comment would get him going. Hiccup was more prone to prolonged foreplay and long kisses than Eret. As much as she enjoyed that most of the time, right now Astrid just wanted to get fucked.

Another shudder ran through Hiccup at her words, and when he spoke again, his voice was noticeably rougher; Astrid shivered slightly just at the sound.

"How about I put that smart mouth of yours to better use first?"

Hiccup practically purred in that rough, honeyed voice, grinning when her breath hitched. She certainly wouldn't mind that either. But before she could react, another voice interrupted their little verbal combat.

"I think that's a wonderful idea,"

Eret commented. She and Hiccup looked up just in time to see him saunter over toward them. Wow, they hadn't even heard the door. It was good that the boys had developed a certain caution when it came to bringing others to their home, lest they get caught inside their sister by strangers.

"Or even better, how about you use your mouths together? I bet getting oral from you both is to die for. We could even make it a challenge and use a stopwatch to measure the time, your oral skills against my stamina."

He grinned, unashamed as ever, and flopped down on the sofa next to them. Without making the slightest move to get off of Astrid - though she would really quite like if he got her off - Hiccup craned his neck to look at his twin.

"You know what? That's not even such a bad idea,"

He said. Astrid sort of agreed but also sort of thought it was unfair she was being made to wait so long for them to do something rather than just fill her needy body somehow.. Hiccup seemed to notice. Up close, Astrid saw his lips pull into a smirk before he leaned down to whisper into her ear.

"Don't worry, you'll get what you want."

He ground against her once more, making her gasp before he pushed himself up, much to Astrid's dismay as his weight vanished. He shed his shirt - something Astrid was much happier about, and she hadn't missed that it was the very dragon shirt that had given Astrid away the first time she'd spent the night with them. Her eyes dragged down his bare torso, keen to see Hiccup undress further but he paused when he reached for his trousers.

"You two want to keep your clothes on or what?"

He asked, and neither Eret nor Astrid needed more of an invitation, already working at her top.

"What's on your dirty mind H?"

Eret asked curiously.

"I prefer sexy imagination," Hiccup corrected with a roll of his eyes "and you'll see. Just like you said, we're going to put your famous stamina to the test. But with something else we've never done before."

Astrid watched the back and forth between the twins with a mix of amusement and impatience. As curious as she was for what was on Hiccup's mind, she rather missed his warm weight on top of her, and hoped that whatever plan her brother had meant one of them would be inside her soon.

As if he'd been able to read her mind - or, more likely, her face or needy squirming - Hiccup tipped his head toward her while looking at Eret.

"How about you get started with giving Astrid the fuck she's been waiting so patiently for? I'll be back in a sec."

A little bemused, Eret gazed after Hiccup for a moment then shook his head, chuckling. He turned to where Astrid was currently struggling to get her clothes off without standing up; she just wanted him on top of her, inside her, weight pushing her down into the cushions...

"Need help with these?"

Eret didn't wait for a spoken answer, just tugged off her skirt and underwear in one motion when Astrid lifted her hips for him, smirk playing across his mouth as Astrid spread her legs, keening softly as she thrummed with need.

"Looks like someone is a little eager, eh?"

"You have no idea," Astrid growled and reached to open his trousers for him "and it looks like I'm not the only one."

She commented when she felt his hard cock in her hand, hot and throbbing between her fingers. A laughing Eret settled between her spread legs, his rough hands gliding along her sensitive inner thighs.

"What can I say? Knowing that I'd come home from uni to you both being here made it a little hard to concentrate on my lecture... I had to stay behind a minute so I wouldn't get in trouble for pitching a tent."

"I'd say - uh - say I'm sorry, but dad taught me not to lie," she gasped as he probed her with his fingers, humming when he found her wet and wanting. Any relief from Hiccup's hand earlier had long worn off, her arousal climbing as Eret teased her "but w-what can I say? I'm utterly add - fuck! - addicted to you two."

She added, making Eret smirk at her breatheless tone, at the way she'd cursed when he dipped fingers inside her only to pull back when Astrid clenched at them.

"Same here."

He murmured as he leaned down and kissed her, pushed into her in one fluid motion and Astrid almost sobbed at finally being filled. Gods, how was it possible that something felt so good? She hadn't been exaggerating just now; she was utterly addicted to all this, couldn't get enough, and bringing down the number of encounters to be smart and responsible just plain sucked, even if it had been her idea. It sounded a lot less important to be sensible when Astrid was finally getting what she'd been desperate for.

"Looks like I picked the perfect time to come back."

Hiccup's voice came from somewhere to her side. Even with her vision blurred with desire, Hiccup was a gorgeous sight, all lean muscles beneath smooth and freckled skin. His expression of naked lust only added to that.

"Wouldn't have wanted you to miss anything."

Eret mumbled against her neck, rolling his hips in lazy trusts. Astrid wished he'd go harder, rougher but suspected he'd get to that soon enough. Her brothers certainly knew by now that she could take it; that she liked it rough. But for now he kept fucking her with that maddeningly slow pace, almost casual as he turned to speak with Hiccup. Astrid mewled, encouraging more movement..

"So, what is your plan? Where did you go just now?"

Grinning, Hiccup held up a small bottle. Lube? But why would he…

"The one we kept in here ran empty last night" gods, those two might be worse than Astrid! "remember? So…"

"Oh, for fuck's sake!"

Eret cursed, body shuddering and eyes glazing over. With Eret still effectively fucking sense clean out of her, Astrid didn't quite get what the boys were talking about. It quickly became apparent when Hiccup settled behind Eret.

"Oh, fuck, oh, fuck, oh fuckkkkk."

Eret groaned through gritted teeth, his arms at her sides trembling as Hiccup worked him open with lubed fingers. His hips rocked forward when she recognised the sound as Hiccup's fingers found his prostate, the surge making Astrid moan and Hiccup chuckle.

"Ready for more?"

Hiccup asked, voice low and rough and Astrid knew he was struggling to hold back himself now.

"Fuck, yes!"

Eret growled. Hiccup winked at Astrid over Eret's shoulder before she could no longer focus as Eret bucked again.

"Told you we'd put your stamina to the test."

Astrid couldn't see what happened, but judging by their mutual drawn-out groan Hiccup was pushing into Eret right now, and the mere image in her head made her moan too. They were so close now, all three of them at once and it made her shudder with knowledge alone.

After a minutes pause to let Eret adjust Astrid's assumed, Hiccup began moving. It was an odd sensation at first, not as precise when Eret got pushed into her by their brother, but gods did it feel good, clumsy and messy and perfect. Seeing the pleasure on Eret's face as Hiccup pounded into him, while also feeling part of that same pleasure herself was enough to quickly drive her higher and higher, and their almost synchronous moans didn't help to slow things down either. Air thick with erotic sounds and her skin flushed and hypersensitive, Astrid was already mindless with pleasure.

"Scheiße, ist das geil," Eret cursed. "Oh, fuck, I… Joder… Oh, coño."

Astrid laughed at Eret's colourful multilingual cursing, struck with an additional idea to raise the stakes despite rapidly declining brainpower.

"L-last one to c-come picks the movie."

She gasped, drawing helpless whines from both her brothers. They were close, already fighting to not lose control and Astrid fared little better. Where Eret found the mind to reach down and play with her clit she couldn't tell, but Astrid wouldn't go down that easily. She reached around him, one hand clawing at his back, knowing how that threat of pain got to him, while the other hand wandered on, searching.

"N-not fair!"

Hiccup whined when she found his nipple and pinched it. Her fingers obeyed her less and less with each thrust, and it didn't take long after that until Astrid's mind blanked out and pleasure consumed her. Somewhere in the back of her mind she registered deeper cries, her brothers shouts telling her that they'd reached bliss themselves.

"So, who won?"

She asked breathlessly after they'd slumped down on either side of her. It was a snug fit, but they were all sort of lying on each otther and not shy about touching. Skin damp with sweat glowed, familiar scents surrounding her and Astrid basked in the familiar, comfortable afterglow.

"'m not sure,"

Hiccup mumbled, lazily nuzzling against her breast. He always got so mellow after sex, and Astrid found it rather endearing. Eret probably did too, but he was almost as dopey and unlikely to comment on it.

"Me neither."

Eret sighed, chuckling. He lay stretched out at her side, one big hand caressing her stomach, trailing up and down her waist and thighs, fingers ghosting over her tattoo.

"But how about we call it a draw? Because I'm all up for a repeat performance some other time to determine the winner. And by some other time I mean maybe twenty minutes."

Both she and Hiccup laughed weakly at that.

"I can imagine."

"I think twenty minutes is a tad optimistic. I might get hungry before then."

Hiccup mumbled, and Astrid hummed in agreement. She certainly wouldn't mind a repetition either. Or finding new ways to mix and match and play for who could hold out...

For a little while longer, they lay there, lazily exchanging cuddles and caresses, when the comfortable silence got interrupted by a sudden metallic tune.

"Not my phone."

Hiccup declared, and wriggled closer to her chest with a sigh. Eret replied that it wasn't his either just as Astrid recognised the melody.

And froze.

In a haste, she struggled to free an arm from the heap of entangled limbs, stretched to lean over Eret to reach for her phone where it stuck out of her skirt pocket on the floor. However, she didn't need to see the picture or name flashing up on the screen, not really. The melody, a specially designated tune, had already told her who was calling.

"It's Mom!"

She gasped, jolt of fear making her hands shake. Why was their mother calling? Why now? Did she know what they were doing? What they had done just now? No, she couldn't… But she surely would know as soon as they talked. She would hear it in Astrid's voice, rough and ravished, and… and…

She threw a panicked look at her brothers. What was she supposed to do? Hiccup and Eret did not panic, just exchanged a quick glance, then Hiccup took her phone out of her hand just at Eret mouthed a quiet Relax! in her direction.

"Hey mom!"

Hiccup tapped 'answer', greeted their mother cheerfully.

"Hiccup?" came Valka's surprised voice out of the speaker. "Is that you? I thought I'd… oh, never mind. How are you doing?"

"Oh, you did call Astrid, if that's what you were wondering," he replied, chuckling "but she's still catching her breath. She... just came in. Panting as if she ran all the way here, and all red in the face."

Next to her, Eret choked as he fought to stifle laughter, but all Astrid could do was stare in shock at her brother. Was he serious?

"Oh, I see. Well, I was only calling to check in with her about you three coming back home soon! She seems much busier than you two... you are actually working up there aren't you boys?"

Hiccup grinned. Astrid got the feeling she'd want to throttle him any minute.

"Eret and I are hard at work" his smirk was obscene and Astrid couldn't help but squirm "and I am sure Astrid would love to come."

Yep. He was dead. So dead.

"Give me my phone muttonhead!"

"Nope" Astrid couldn't even reach to fight him for it, because Eret had grabbed hold of her "I got it. You'll see mom soon. After we go down together."

It was so inappropriate and honestly downright evil of Hiccup to remind Astrid of earlier comments when she could not moan or enthusiastically agree or bite him, forced to contain herself as Eret began rocking his swelling cock against her, fingers toying with her where she was still sticky with his come.

"Yes mom, I promise I feed her at least weekly" and the rest, Astrid thought "now put that in your mouth. You were complaining you were hungry earlier."

He watched, eyes keen as Astrid bit her lip, twitching before she complied and slid to kneel on the ground, holding Hiccup's gaze as she took Eret into her mouth. She could taste herself on him, didn't mind and wouldn't have cared anyway. Not when they were both looking at her like that, when Hiccup was reaching down to squeeze his cock while Eret bit his fist to stay quiet.

"Yeah, we'll see you then! I better go finish up before these two eat me."

The call was ended rather abruptly, but Astrid knew Valka would be so happy to hear they were visiting she'd not think much of it. Truthfully, Astrid had pretty much forgotten by the time Hiccup joined her on the floor, Eret getting his wish of them both.

They'd forgotten to set a timer, but they could always try again...

-HTTYD-

I swear this chapter was meant to contain more than just smut, but, well, Astrid disagreed.