Kirbster676 - thank you very much! And yeah, Astrid doing anything for Hiccup is kinda important for this.

Argo0 - wow! Thanks. I don't think I'm particularly good at either of those, I mostly just like writing things nobody else does and somehow people like that? But complex pairings are a favourite of mine (even if a threesome isn't technically a pairing?)

This probably took me a while to write, since I'm buried in requests (yay) and have active stories to stay on top of too!

-HTTYD-

"Gods Hiccup..."

Astrid closed the door to their hut behind her, ears immediately full of a voice laden with desire. Apparently, not only had she not been noticed, but those two hadn't listened to her warnings about anybody being able to find them in the main room of the hut.

Hiccup was knelt awkwardly over his mother, hand hidden beneath her tunic and it didn't take a genius to know what was going on as she arched and moaned, occasionally leaning up to kiss him. Hiccup obliged her willingly, pressing their lips together and Astrid felt an array of emotions whirl around her chest.

"You're so hot like this, I love the sounds you make."

His own voice carried the desires for Valka Astrid didn't understand, but had encouraged for the sake of her loves happiness, thick with lust as he continued to touch his mother in ways a boy never should.

She wasn't sure why she didn't make herself known, stayed still to not make a noise and just watched. Hiccup seemed to speed up his motions judging by the responses he won, an unmistakable orgasm happening before her eyes as Valka cried out and pressed her face against Hiccup's chest to muffle her sounds.

Actually, Astrid was certain why she just watched. Why she froze.

Because the sight that should have sickened her had a completely different effect, the first flickers of something entirely unexpected licking at her insides.

Arousal.

What the Hel was that about? Astrid tried to ignore it, watching as the two kissed softly, reconnecting intimately before Valka rolled them over. She was on top of Hiccup now, reaching for his erect cock. Hiccups head tipped back, eyes rolling back a little.

Then he spotted Astrid.

"Have... have you been there long?"

Valka turned toward her now, hand still around Hiccup's clothed erection. Astrid felt her cheeks warm as though she had been caught, not them.

"Long enough. I warned you, anybody could walk in."

"We uh, got carried away?"

Astrid tore her eyes away, feeling her gut warming further rather than cooling her ardor at all, opting to walk past them as though it wasn't a mother touching her son in an intimate, sexual way.

"You may want to relocate then. Two bedrooms in this place and you're on the floor by the front door."

She swallowed some water from her mug, wondering if she should give it up as a bad job and escape to her parents - still technically her own home - fir dinner rather than wrestle with a twisted fascination for the really quite unnatural bond Hiccup and Valka were sharing.

They didn't move. Well, not unless Astrid counted Valka yanking Hiccups leggings down and following their direction. Hiccup arched his back and closed his eyes, moaning in ways that were intensely familiar to Astrid from when she had gone down on him herself. When she next glanced over, their heat had only grown and Hiccup wasn't there with his eyes closed.

He was looking right at her. Not at the woman who was devouring his cock with almost alarming hunger. There was a smouldering gaze there, but a question too of whether Astrid was still ok with it. Somewhere between concern and seduction... not two things Astrid had ever expected to see. She swallowed thickly, nodded shortly at Hiccup and hurried up the stairs to take off her training armour, because it felt too damn tight all of a sudden.

She splashed some of the cold water in a jug on Hiccup's desk over her face, trying to cool herself down. It did little to help, and by the time Hiccup returned upstairs to find her, Astrid had replayed the events downstairs in her mind so many times she was flustered and almost angrily aroused.

"You coming down for dinner babe?"

His own cheeks were flushed, eyes wary as he wondered if Astrid were mad at him. Instead of answering she crossed the room in three strides, then Astrid hauled his mouth against hers and dragged him toward the bed. Part of it was a need to reassure herself Hiccup wasn't simply going to lose interest simply because his mother could help meet his sexual desires, but mostly Astrid felt if she didn't get off soon she would lose her mind.

"Is this" Hiccup managed to eek out words between kisses "some kind of" Astrid bit his lip lightly "territory thing?"

Astrid stopped, looking up at him suspiciously.

"You think I need to mark my turf like a dog?"

"No, no! Just... if every time I'm with one of you the other is going to jump on me, I'll have to start asking Gothi for stuff for stamina and virility that's all. At no point am I considering turning you down!"

She surveyed him coolly for a second, but he appeared genuine. Hiccup was a pretty awful liar most of the time, and he wasn't pulling away. His pupils were dilated, trousers starting to tent.

"No, it's not a turf thing. I came home intending to jump on you and you were busy."

Now she was lying. Astrid was much better at it than Hiccup; her parents still believed all she and Hiccup did was kiss.

"Allow me to make that up to you immediately."

There was no hesitation as Hiccup kissed her, no words of "my mom's alone downstairs" or "it's dinner", just the usual heated desire he had for her that just couldn't wait, mouth a hot rough friction against her own as Hiccup hiked up her skirt and smirked against her lips, finding no leggings and damp underwear.

Astrid was so wound up she moaned at the first pressure of his fingers between her thighs, stroking the wet material and rather than offer relief, he was ramping up the heat inside her further. His erection pressed against her thigh as they fumbled on the bed, Astrid reaching for his waistband to free his cock as Hiccup undid the tie on her underwear, pulling the material away from her.

"Don't tease me now."

"As you wish milady."

Something about his casual use of his nickname for her soothed an anxiety Astrid hadn't noticed she had, lifting her hips and letting out a soft cry when Hiccup penetrated her, sliding into her body with ease as her arousal made his shaft slick.

"Thor Astrid, you feel so good."

He kissed at her jaw, nuzzled her neck and peppered kisses across her mouth, always moving before Astrid could kiss him properly, leaving her caught between pouting and gasping with each one of his thrusts. It wasn't any different to when they usually had sex, but Astrid felt like it meant more that he was putting every usual bit of effort in with her, treasuring their intimate connection.

Every push of his narrow hips left Astrid reeling, pleasure rolling through her in waves and even while she couldn't understand it, all Astrid could think about was how Hiccup had looked up her when his cock was in his mothers mouth.

If they would be thought criminal or sick for loving each other that way... what did it make Astrid for getting hot under the armour watching them?

Valka probably wouldn't get off watching them, and she was the one aroused by her own son. Hiccup wouldn't... actually, no. Astrid reckoned Hiccup would probably quite enjoy watching Astrid and Valka roll around naked together. He was attracted to both of them.

"I'm close babe, did you drink your tea today?"

Hiccup's forethought was convenient, especially since Astrid had been lost in her own head while her body kept up with his. His thighs were shaking between her own as he held back, Astrid casting her mind back to that morning.

"Fuck, no."

"Ugh, hang on."

Astrid could have cried as Hiccup pulled out of her, spilling onto the bed fur rather than empty himself all over the clothes she was still wearing. As soon as he stopped coming, his fingers were pressing inside her, thumb against her clit to rub lightly until the already-close Astrid joined him in satisfaction. He cleaned up while Astrid recovered, then bent and helped her to her feet, kissing her temple.

"I love you."

"I love you too babe. Now... I remember you saying something about dinner?"

"I did!"

When the two made it downstairs, Valka was quite clearly playing with her otherwise finished meal with slightly flushed cheeks. Perhaps she was embarrassed to have listened to them, though she had not been shy when going down on Hiccup in front of Astrid.

"Dinner, as promised."

Hiccup handed Astrid a bowl of broth, leant down and kissed the top of his mothers head; winning a smile before sitting next to Astrid. He seemed to do well balancing the two without neglecting one so far, and Astrid mused that love was not a finite resource. They could make this work.

Things continued on like that for a short amount of time, weeks of Astrid's awkwardness at their shameless enjoyment of each other within the Haddock household. Hiccup didn't bring up anything changing until they were on a rare relaxing flight, just the two of them.

"This is kinda unfair of me to ask, but... would you mind if I slept with mom tonight? Only... she has to sleep by herself every night and I feel bad that she's lonely "

Astrid frowned, thinking on his words.

"Actually... yes. I would."

Hiccup did a good job of hiding his disappointment, but it was there. Luckily, Astrid wasn't done.

"However..."

When they got back that evening, Hiccup kissed Valka even though his arm was still around Astrid's shoulders.

"Astrid turned me down by the way."

"I see. It's understandable."

Valka, less skilled in hiding her feelings after so long with dragons, who scarcely used their face to convey emotion, turned away.

"But... she had another suggestion. You come sleep in with us."

Wide green eyes landed on Astrid, Valka's expression one of surprise.

"Wait... really?"

"On the condition it's not all the time. I mean, I still plan on marrying this idiot and you weren't in my mental images of our wedding night."

Both Hiccup and Valka were clearly enthused to simply share their night in a rather platonic way, and Astrid found she didn't actually mind all that much seeing an arm slung across Hiccup's waist, the odd time she woke up and he had turned to embrace his mother in his sleep.

She did however mind that her mind wouldn't stop conjuring far less innocent images of all three of them together in bed. They never did more than kiss in the bed Hiccup and Astrid shared, a level of respect she hadn't expected or asked for but still received. Even so, Astrid would find herself aching to feel Valka's eyes on them as she and Hiccup twined, or watch them together again. Occasionally, she even wondered if Valka kissed the way Hiccup did. They were so alike...

She didn't verbalise any of that, instead focusing on something different altogether.

She came home that evening, exhausted and grubby from Berk Guard training, finding the hut relatively quiet. No Valka, no dragons. Just Hiccup and a hearty, delicious meal waiting.

"What's this?"

"Do I need a reason to feed you?"

"Hiccup, you're a terrible liar."

He chuckled, nodding in agreement.

"Alright, fair enough. I did have an ulterior motive."

Astrid watched him, thinking longingly of food and a bath and maybe one of Hiccup's amazing foot rubs. Then he dropped down to one knee in front of her, holding her hand in both of his.

"Will you marry me?"

Stunned and confused, Astrid meant to say yes. That wasn't what came out.

"You do know we're already engaged?"

His smile faltered a little, but Hiccup soldiered on.

"I know. I meant... can we start really planning it? You've been so amazing and... accepting and I couldn't love you more if I tried. I want to marry you, for real and have everyone know you as my wife."

"Of course I'll marry you, you dolt. Now kiss me, then let me go wash up for dinner and then you can rub my feet."

Hiccup obliged happily, picking her up and spinning on his metal leg with a grin.

"Thank you. And of course, you can have all the foot rubs you like. Even when we're married."

Hiccup didn't stop beaming all evening, and when Valka returned the next morning she actually congratulated them. Hiccup headed outside to fetch eggs for breakfast, leaving the two alone - a fairly rare occurrence.

"You're happy for this? Really?"

Valka nodded, a small but genuine smile across her Hiccup-mouth.

"I accept that not only did you have Hiccup's heart before I, but that he loves us both and that may well always be the case. He is happy, so I'm happy for you both. And let's be fair, it's not as though the gods would bless our union."

Astrid couldn't have genuinely guaranteed she would be happy as effectively Hiccup's secret mistress, but Valka wasn't trying to detract from the moment at all. She even gave them the next night alone together again, and Hiccup enveloped her in his arms with soft kisses and caresses.

"Are you happy?"

She didn't need to think as hard as she expected to.

"Yeah, yeah I am."

-HTTYD-

Now... I'm going to go write the Hiccup/Astrid/Heather request I got... and call it a practice run before anything happens between Astrid and Valka. So if ch3 is slow in coming (heh) that's why.