Wow last chapter got a lot of response and we three writers got very excited about it! And evil-laughed. A little. Maybe.

-HTTYD-

Eret sighed, reluctantly letting Hiccup go so they could finish getting dressed. They couldn't cuddle forever. Well, they could. But it might get awkward after a bit. Eret would definitely get hungry.

"I miss her."

Hiccup admitted quietly, and when Eret looked over he saw Hiccups hand lingering on the side, Astrid's shirt resting there neatly folded.

"I miss her too."

"Should we though? It's not like we didn't just spend most of a week with just her."

Eret shrugged, hunting through his wardrobe for something to wear. It was the only time he lamented Hiccup being built so lean - he had tons of cool shirts, but Eret couldn't even get them over his arms, let alone his shoulders.

"Maybe thats why. After all summer and then the last week... we got used to her being around a lot?"

Hiccup nodded, mouth tipped up in a small frown.

"Guess so."

His fingers brushed the fabric, then Hiccup turned away, marks on his back and chest healing but Eret could easily map the journey Astrid's mouth and hands had taken over their brothers torso, picture the way Astrid's fingers clutched...

And now he had an erection. Telling it to wait a bit, Eret pulled on a comfortable vest, then saw Hiccup's eyes fall down his body before there was a raised eyebrow and a knowing smirk on his face.

"Need some help?"

"Save it hot stuff, we have a reputation to maintain."

It wasn't like having sex was the worst thing in the world, really. Eret loved sex, but then he and Hiccup had been fooling around since early teens, and having sex pretty much daily since they were fifteen. But the longer he and Hiccup continued their... thing with Astrid, the longer Eret felt the niggle of awareness that their casual hook ups were... not as much fun as it used to be. Except watching Hiccup. That would always be sensational, Eret knew.

But Astrid was right. They had to keep up appearances, and Eret always got more into it once they were out and he was watching Hiccup give people those smiles of his that could have underwear hitting the floor from across a crowded room. Eret had something of a reputation for rising to half-mast easily, even before anything was happening; nobody but his siblings knew it was because Hiccup was so damned sexy.

"Ready to go H?"

Hiccup checked the inside pocket of his jacket, nodding; he carried condoms and sachets of lube, since they didn't always make it back to their place. Much better to carry than be caught unprepared. Eret gave off heat like a furnace, so he rarely wore jackets. It made sense for Hiccup to do it.

"Ready."

They headed out, sharing a few sips of whiskey from Eret's flask on their way to get them a nice, gentle buzz of warmth from the alcohol going. That way, they didn't drink too much when they got to the party, and made smart, sober choices - which included recognising if anyone hitting on them was too drunk.

"Eret! Hiccup! Hey, did we order strippers?"

"No, but I'll strip if you want Dagur!"

There was a laugh from those who heard as the twins arrived, grabbing drinks and slices of pizza from the table before they were greeted by several people. Eret couldn't help but notice that out of the dozen or so people that said hi to them, they'd slept with at least ten of them. Given how much time they spent in the sexual health clinic, Eret thought they should probably start volunteering there to make up for it.

He spotted Heather, automatically looking for a distinctive golden head near her and admitting disappointment to himself when he saw none. Hiccup threw him a look that said he had similar feelings, but Eret reasoned that Astrid was probably sore after the last few nights... and last time they were at the same party, the three of them had completely lost their minds and fucked in a back room. It had been hot and amazing and reckless, a stupid choice Eret would never take back. So maybe it was better Astrid wasn't there too. She could get some rest, he chuckled to himself. Hiccup laughed and rolled his eyes when Eret whispered it to him, shaking his head as he bit into the pizza in his hand.

"It's not like she was limping or anything..."

"How would you know? She had to sneak past."

That incident with Thuggory felt like a while ago, despite it having occurred that day. Eret had jumped Hiccup after they left, after that damned tempting show Hiccup put on it was essentially a given. Hiccup certainly hadn't minded.

The majority of people who were interested in a hook up that night with them were polite enough to give the twins a little mingling time first, which was good. Eret looked over to Heather again, thinking. Astrid's text was fresh in their phones... was it too soon? They'd both given Heather an appreciative glance or two over time, but Astrid had only put an embargo on a single person and they respected it.

He turned to Hiccup, asking silently. Hiccup chewed thoughtfully, then winked at Eret and washed his pizza down with the fruity cider he favoured over cheap beer.

"I'll go. I have an idea."

Eret watched as Hiccup slid through the mass of bodies, never struggling to pick his brother out of even the most dense of crowds. He saw Hiccup approach Heather, who seemed pleasantly surprised by his appearance, though Eret didn't need to be there to know Heather was asking why he was hitting on her after they turned her down before. Our sister asked us to was not exactly an excuse they could use.

He also saw when whatever Hiccup said seemed to convince Heather, her face turning from confusion to interest. Damn Hiccup was good.

"I think that might be a record for you two, not even fifteen minutes."

Eret heard a voice to his side, nodding at the tipsy redhead who had joined in the Hiccup watching. Atali, he thought her name was. Not one of their 'conquests'. In fact, Eret was pretty sure Atali was in on the Heather watching side...

"Hey, Hiccup is welcome to pick someone up for himself you know."

Though that happened less than it used to, Eret mused. More often than not, if one twin came home and the other was with someone, the someone was up for playing with the other twin too.

"I am sure he is. Well, enjoy your night Eret."

Atali melted away, Hiccup returning with Heather at his side a moment later.

"I was just telling Heather here that we had to put in rules about moving through friendship groups too soon."

"Oh, yeah. Don't wanna cause tension."

Heather looked between them, nodding slowly.

"And here I thought you weren't interested."

"Cliche as it will sound, it was us, not you."

She cocked her head, looking Eret over and he felt very much like prey being hunted. It wasn't an unpleasant feeling at that moment.

"Astrid said the same thing."

She had? That was news to Eret, she'd not said anything to them.

"Well, she made a good guess then. Wanna dance?"

None of them were expert dancers, but then it wasn't really about that. It was more about the close physicality, hands and hips on the move, communication reduced to touching and playful smiles. Heather made the first move from maybe to I'm into this, kissing Hiccup with no hint of shyness. Eret watched for a moment, catching sight of Dagur across the room with a frown before he covered his eyes and walked off. Eret laughed, disturbing the couple in front of him who both looked up.

"Something funny?"

"Doesn't matter, gone now. As you were."

He gestured as though awaiting the resuming show, which got Hiccup rolling his eyes before Heather turned between them and leant up to kiss Eret.

An odd but rather welcome 'side effect' of the twins reputation, of the regularity with people took them up on the chance of a threesome? There was a lot less animosity toward anyone, particularly the women, who was seen kissing multiple people in one night, because Eret and Hiccup would happily call them out for not minding when it was them. They'd even had a handful of people who came back to them to say "thank you", for giving them the confidence to pursue polyamory, no longer ashamed after they'd hooked up with the twins and it hadn't been the end of the world.

There was a little more drinking, eating, flirting; Heather was funny and witty now she was no longer wary of rejection it seemed, and Eret could see why Astrid enjoyed hanging out with the dark haired girl - she was good company.

"Wanna get out of here?"

Heather clearly didn't waste time. But then Eret could see her pulse fluttering rapidly at the side of her neck, dilated pupils, the light flush across the visible skin of her chest and the way her tongue came out to wet dry lips. Everyone was different, but arousal tended to show itself in a few familiar ways too.

"I thought the reindeer on the door was a joke."

"Hey, don't hate on the reindeer!"

Laughing to herself, Heather took in the surroundings for a minute; they were used to that, and Hiccup joked it was like in Doctor Who, when new companions first got to look inside the TARDIS.

"I have heard many stories about this place" Heather commented as she slid her jacket off, eyes lingering on the poster of the Aurora Borealis by the door "now I finally see it for myself."

She didn't seem intimidated, which he liked. They kicked off their shoes before Heather was the one all but dragging Eret closer by his wrist, hands sliding around his waist as she pressed herself against him firmly. Hiccup didn't wait idly, running his fingers down Heather's back and finding early on she was quite sensitive there as she stopped kissing Eret to shiver and mewl. Then she was turning, kissing Hiccup with equal fervor and Eret was the one teasing her with light caresses, the tried and tested way to get somebody flustered and turned on with little work as they fought to decide which way to lean.

Hiccup ended up pinned to the wall by her, a low grunt from him sounding as he knocked into the stand by the door in response to her eagerness. Heather was forward, teasing, playful... not unlike Astrid, and definitely something the twins liked. Something fell from the stand, landing close enough that Heather turned to look, leant to pick it up. Hiccup threw a wide-eyed look to Eret behind Heather's back at what she was holding.

"Hey, you know Astrid has a shirt just like this. It's not hers is it?"

""That would be weird with her having been here… what, January or February? No, iNo, it got left here last week by... someone. I left it there so I could take it back to them, and keep forgetting."

For a few tense seconds, Eret was pretty sure Heather didn't believe him. Hiccup tugged it from her hands and placed it back on the side.

"Did you really come here to check out some other girls clothes?"

"Definitely not. Bedroom?"

They led her to Eret's room, almost forgetting themselves and heading for Hiccups instead. That had been a little close, but Heather seemed sufficiently distracted by the time she was on Eret's bed being undressed by Hiccup. She pushed at his top too, revealing his chest and stilling with a curious expression.

"What's up?"

"I didn't know you had a tattoo like his. Is it a family thing?"

Hiccup glanced down, rubbing his chest and nodding.

"Yeah. Eret looks like our dad who has one too, and he was a firstborn so he inherited his name and shows his heritage openly. I have his heart, so mine is on my chest."

Astrid wasn't technically of the Sami bloodline, but their father had always said she was welcome to bear the mark too. She chose her hip as it felt intimate and personal to her - somewhere few but a lover would put their hands, hidden unless she chose to show it, but always with her.

Falling back to the pattern of casual hook ups was always a little strange after a summer where Eret and Hiccup were only intimate with each other. But now, after the summer with Hiccup and then the first week consumed by Astrid, the strangeness was more tangible. He saw it in Hiccup's face too, the twins sharing a look that seemed to grab Heather's attention a little too closely.

"Everything alright?"

She was watching them a little strangely, and Eret realised they ought to cover up and fast.

"Yeah. It's a twin thing. We don't really need to speak to know what the other ones thinking."

"Oh. Makes sense I guess. Is that your secret?"

"Maybe."

Eret joined them on the bed, exchanging kisses and touches as they undressed themselves and each other. Heather gripped him through his briefs, grinning against his mouth.

"So that wasn't an exaggeration."

He didn't ask who'd been talking size with her - it could have been anyone, Astrid had told them exchanging stories about the twins was perfectly normal common room talk. Hiccup pushed up on his elbows, leaning against the headboard of Eret's bed for a minute and watching the two.

"So Heather, what did you come here for?"

Heather rolled onto her back, looking at Hiccup with surprise.

"Are you seriously asking me that now?"

Hiccup closed his eyes, laughing lightly.

"Not like that. I mean more... what do you want?"

Heather bit her lip, glancing between them.

"Well, do you guys ever... at the same time?"

"Just say double penetration, we know what it is."

Rather than flush, Heather's face turned ever more interested as she sat up, widening her legs slightly as Hiccup's hand moved to touch her.

"Yeah. That. I tried it once and it was good, but most guys get weird at even the thought of another erect penis in the room."

"Well, that would make our lives very difficult. Not to mention quite a few of our partners have cocks of their own."

Heather's eyes widened.

"Oh. Let's not go there, you guys hooked up with Dagur and I don't wanna think about that right now. So, is that a yes?"

Both twins had to bite back a laugh - Heather's comment about hooking up with her brother, or anyone making similar remarks always had a wonderful touch of irony for them to hear.

"We have done that, though it's always by request. It's not something everyone is in to."

Eret had to fight not to remember times he and Hiccup had shared muttered fantasies together, of Astrid asking them for it, of the feel of them all so close... his cock twitched, the motion caught by two sets of interested green eyes. At least Heather wouldn't notice Hiccup looking when she was distracted too.

"Well, while I know you have a rep for great morning sex too, it's mine and Dagur's weekly catch up breakfast so I can't hang around. Meaning I plan on getting as much out of you both as I can tonight."

Sharing a look with Hiccup, Eret nodded, both moving in sync until Heather was pressed between their bodies, fingers sliding down over her hips to rest against her thighs.

"You can tell Dagur we said good morning."

"After we show you a good night.

Glaring at her phone, Astrid heaved a great sigh and accepted she wasn't going to be getting anymore sleep. It wasn't even light out, but the whole night had been a struggle to drop off. Too used to warm bodies and orgasm-induced sleepiness, Astrid had found the night long and lonely. Still, it was just an adjustment after a busy week. She could manage without them, damnit!

Figuring she might as well make use of the chronically early hour, Astrid got up and changed into her running gear. She could jog over to the twins place, drop in, grab her shirt and be gone before anyone was even up. Astrid wasn't even thinking of how she'd love to crawl into Hiccup's bed, surrounded by familiar scents and just wait for her brothers to find her there... not at all.

The sun was barely rising when she left campus, still a touch uncomfortable if she moved too fast after the bed-based workout of the last few days. Astrid pushed through anyway, leaning against the outside of the flat block to catch her breath before she let herself in, opting to take the stairs up to the boys flat as part of the workout. Her legs did not agree with the idea, but Astrid made it up to their floor, fumbling for her keys to open the door. If she was quick, she might go entirely unnoticed. She did hope not to overhear them having a typical morning tryst, because she didn't want to hear Heather.

Key in hand, Astrid was reaching for the door when the handle moved for her, and she barely managed to hide out of sight before Heather left the boys flat. There was not a single explanation Astrid could have made to explain her presence there. Heart pounding harder than on the entire trip over, Astrid waited for Heather to disappear into the lift to take her downstairs before she dared even breathe again.

Wow that was close.

The door was still unlocked as she let herself in, expecting the twins would still be asleep and she could grab her shirt and then awkwardly head home without being spotted by Heather. However, Eret was already up, dressed in loose pyjama shorts and facing away.

"Forgot someth- oh, hey Astrid."

He smiled widely at her, immediately heading over before he frowned slightly at her tension.

"What's wrong?"

"Heather almost saw me. I came to get my shirt, she literally almost walked into me."

Eret pressed a kiss to her temple, ignoring that Astrid was sweaty but thankfully not trying anything more - he was pretty good at spotting when Astrid wasn't in the mood.

"Want to jump in the shower before H wakes up? Or are you running back?"

Astrid opted to shower rather than sit in her sweaty gear, since Eret was already suggesting breakfast and Astrid's tired body cried out for energy. Slipping her shirt on and tossing her running stuff in the laundry pile since she did her washing there anyway, she headed out to find Hiccup awake and leaning into Eret's chest, yawning.

"Morning Astrid."

"Hey. Good night?"

"Late night, but early Astrid visit is worth getting up for."

She couldn't help but smile as sleepy Hiccup headed over to hug her, skin still sleep-warm and Astrid recognised some of the healing marks on his body as her own handiwork.

"Ret and I are gonna grab a shower, I'll feed you when I come out."

They both kissed her before they headed to the bathroom, Astrid making herself a drink and checking the sofa for questionable stains before she sat down. The boys weren't gone long, returning with towels rubbing damp hair and shorts clinging rather nicely to wet skin... Astrid dragged her eyes upward, Eret stealing both her coffee and a cuddle when he sat next to her while Hiccup occupied himself in the kitchen.

"Hey!"

"You don't like the cold bit at the bottom, I'm not that fussy."

Rolling her eyes, Astrid let Eret resume snuggling her lazily until Hiccup summoned them for bacon and egg sandwiches. Once fed, both of them worked on soothing her, the fear of almost being caught by Heather easing the longer Astrid felt their arms around her.

"So, how was it?"

"Fine. She was pretty up for it right away, and didn't even come across that suspicious we hit on her. By the time she was here, I don't think she really cared."

Astrid smiled, relieved for the most part. She wasn't jealous - in her mind, Astrid knew the twins would rather be with her than anyone else, but she felt the same. It was hard not to want more of such intense encounters... but they couldn't just spend all their time together, and sex with other people wasn't really a terrible fate.

"I better go. Heather will undoubtedly turn up to gloat."

"She's having breakfast with her brother, so you have time."

They reluctantly let her leave after more kisses and cuddles, Eret dramatically complaining of abandonment until Hiccup threatened to withhold blowjobs if he didn't shut up. Unsurprisingly given Hiccups oral skills, it worked.

Astrid made it back to her dorm before Heather got in touch with her, pulled on a jumper and flopped on her bed to pretend she didn't wish she'd stayed with her brothers. Heather turned up about an hour later, finding Astrid attempting to start some reading but mostly just yawning.

"Morniiiiiinnnnng."

"Someone's chirpy today."

Heather grinned, offering Astrid chocolate as she came in and got comfortable sitting on her bed - a little gingerly, Astrid noticed. Astrid bit into the chocolate, sitting on her desk chair.

"You wouldn't believe where I spent my night."

"Oh? Oh gods, tell me you didn't get drunk and find Thuggory attractive again."

Heather wrinkled her nose, shaking her head as she chewed on her own sweet treat, smug grin returning before she'd even swallowed.

"Oh no. I hooked up with the twins."

She knew Heather was looking for a reaction, something to give away that Astrid was more involved than a one night stand, almost a year ago. Astrid tried to feign surprise, washing chocolate down with coffee.

"Finally! I'm happy for you."

Heather seemed a little perturbed by Astrid's response, and apparently she had more up her sleeve.

"Yeah. While I was there, I saw a shirt that looked awfully familiar. Wasn't you who left it, was it?"

Snorting, Astrid shook her head.

"It's been ages since I was there, how could it have been me?"

"I know its a shirt you own. Red, with the black swirls on the sides and sleeves."

"You mean this one?"

Astrid lifted up her jumper, showing the t-shirt she'd retrieved that very morning, Heather seemed put out, sighing.

"Darn. Guess my theory has a flaw."

"More than one. I mean, I have to hope that if you seriously thought I was dating them, you wouldn't have fucked them."

Heather held up a hand, then dropped it and frowned.

"That is an excellent point. Maybe I was just a little too fixated and put it on you... sorry."

"It's fine, honestly. You brought me chocolate, I'm good."

It didn't take much after that for Heather to start swooning over the night she'd spent with them, and Astrid realised the boys had been holding out on her - both physically and with the details of Heather's time with them - when Heather got progressively more graphic.

"Seriously? At the same time?"

Astrid definitely wasn't picturing it. Well, not with Heather there anyway...

"I know you didn't try it with them, but oh my gods it was sooooo much better with them than the last time I tried it. Probably helped that those two seem to consider foreplay an art form, and they both fuck guys so I guess they know more about lube."

Thankful Heather was too distracted by her own pleasant recollections to notice Astrid's interest, she got considerably more detail than she'd expected and the thoughts alone that wormed their way into Astrid's mind were enough to leave her hot under the collar. And other places. They'd done anal a few times, though since the twins got plenty of that elsewhere it was always down to Astrid to suggest it, and the prep sometimes seemed more time than she was willing to wait.

But they'd never suggested that. And Astrid wanted to know why.

Heather had barely left to go obtain lunch - Astrid had enough to reheat for a few days yet, but nothing appealed to the dark haired girl in Astrid's fridge - when Astrid had her phone in hand, tapping out a text with two pertinent points.

A: So, Heather just left, and it definitely seems as though you fucked the suspicions clean out of her. So, good job! Just one question; how come we have never done double penetration before?

-HTTYD-

Pervstrid strikes again!