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Hiccup was so excited Heather would finally come to visit again, looking forward immensely to do Breathplay with her. Astrid wasn't a bit less excited, looking forward to yet another incredibly intimate experience with Heather as well, and this time underwater. They didn't make a big deal out of the greeting, Astrid's libido, after imagining what she wanted to do, was just too great. So Astrid had already prepared their boat, eliminating the waste of any more time after Heather arrived. Toothless watched Hiccup's and Astrid's preparations intently, getting really curious about what they were so excited about.

“What are you up to?" He asked while running after Hiccup.

“Heather is coming! We're finally doing Breathplay with her!" Hiccup explained hastily.

“Can I join you?" He asked curiously.

“Ehm…Sure, why not!" Hiccup said, kind of surprised about Toothless' intent to participate in their pretty extreme kink.

So this is how Hiccup, Astrid, Heather and Toothless were currently traveling on a boat sailing to their favorite spot in the sea.

“So, Toothless. I have to admit being really impressed about you having transformed. Especially into this crazily hot body of yours," Heather admired Toothless.

“Yeah, he surely is hoooot," Astrid agreed.

“Thank you Heather. It was kind of a surprise for me too, unable to believe what happened to me at first, but now, I am constantly admired by everyone," Toothless explained.

“You were being admired before as well," Hiccup claimed, raising an eyebrow at Toothless.

“That was different. Before, they had respect. Now they love me!" He explained to Hiccup.

“Oh, whatever. I can't deny liking your new form as well," Hiccup admitted.

On their further trip, Toothless continued to tell Heather about all their recent acts, astonishing her greatly.

“This sounds incredible. I knew Astrid was kinky, but that kinky?" Heather commented.

“So, what have you planned for us today, Astrid?" She asked curiously.

“See this rock and these checkless there? These are gonna go on all of our ankles and then Hiccup will throw this rock off the boat, dragging us all down together," Astrid explained excitedly, already getting wet by saying their plan out loud.

“This sounds pretty dangerous…I love it!" Heather exclaimed laughingly, “But how are we gonna get free?"

“Hiccup has the best breath holding capabilities of us…or maybe Toothless, I don't know. Either one of them is gonna unlock the chain from the rock when we're completely done and get us back up," Astrid explained.

“Cool! I've always wondered about how asphyxiation would affect my arousal," Heather told them.

“Good! Because today, you're gonna find out."

Astrid was now putting on her checkless, signaling the others to do so as well. After sitting down on the boat's edge together, Hiccup thrust the stone off the boat, suddenly dragging them all into the sea shortly afterwards. Like the last few times, none of them had enough time to fill their lungs completely, leaving them with mostly half empty lungs for their trip.

Hiccup still loved the beautiful sight of Astrid's breasts swirling in the current, now added with Heathers even more beautiful breasts, giving him the perfect boner. Astrid, as well as Heather, meanwhile immensely enjoyed the view of Toothless' gorgeous muscles flexing underwater, resulting in both of them getting even wetter than they already were.

When they arrived at the bottom, the girls quickly went over to Toothless, getting a good feel of his hard muscles. Heather was especially impressed, given that this was her first time feeling Toothless. The high attention added with his decreasing amount of oxygen resulted in Toothless monstrous shaft getting erect, satisfying the girls immensely. Hiccup got bored quickly not getting any attention, so he decided to swim under Astrid's legs to start suckling on her exposed flesh which resulted in a sudden gasp from her, releasing a decent amount of her precious air, making her panic and getting more aroused at the same time. Astrid could feel the oh so familiar feeling of her chest starting to tighten up, begging her to swim back up and get oxygen, but she knew she couldn't; she was tied securely to the rock, giving her no chance to escape even if she decided to give in to her body's desires.

Hiccup enjoyed Astrid's heighten arousal greatly, giving him an increased amount of pussy juices to suck into his mouth, filling him with amazing warmth in the cold ocean.

Meanwhile, Heather went to do something remarkably similar, but with Toothless cock, the sheer size and beauty of it swirling in the water was just too much for her to resist. But sadly, this caused her to moan immensely around his gorgeous shaft, releasing a considerable amount of her precious air. But she was too occupied with him to notice that, getting Toothless closer and closer to orgasm due to his body being significantly more aroused thanks to the lack of oxygen.

Astrid was awfully close now as well, supplying Hiccup with lots of her seemingly endless amount of juices, but she was even closer to losing her mind about her lack of oxygen; her mind currently screaming at her to breathe again. Her chest was constantly spasming now, thrashing violently in and out, desperately trying to convince her into inhaling again, but she held on; concentrating on her well-trained powerful body to endure as long as possible.

Hiccup noticed her struggles and increased his licking and sucking to an even greater level, making it even harder for her to keep her composure. And then she came, and she came hard, releasing an immense load of juices for Hiccup to swallow while she exhaled violently. She desperately tried to not inhale again, but it was to no use; her body just had to inhale. Hiccup quickly swam back up to face her, greatly enjoying the sight of blue faced Astrid deeply inhaling the sea in hope for relieve, only to be disappointed by discovering the water wasn't supplying her with the oxygen she now so desperately needed.

During the same time, Toothless violently came inside Heather's awaiting mouth, filling her with his enormous load which completely overwhelmed her, causing her to finally exhale as well, only to inhale again. But due to the fact she still had Toothless' orgasming cock in her mouth, she filled her lungs completely with his cum, making her panic and get aroused to extreme levels. Her body was so confused, given that she was constantly inhaling, now also without Toothless' cock, but didn't receive any oxygen, only increasing her panic.

Toothless had to admit enjoying this sight immensely, seeing Heather's so desperate and confused look on her face which was currently getting paler and paler blue, almost turning violet.

He reached out with his enormously muscular arms, grabbing hold of her breasts, massaging them, trying to soothe her. He noticed how she exhaled more and more of his cum, giving him an incredibly arousing sight to watch.

Hiccup in the meantime was teasing Astrid greatly, slapping his extremely hard member against her cheeks, watching closely how her breathing was constantly increasing although presenting no use to her. He then moved on to place his cock between her breasts, loving the constant spasming of her chest, making it extremely easy for him to masturbate himself with the breasts on her water breathing chest. He himself had to admit currently receiving more and more desperate screams of his body to breathe again, only turning him on even more, making it quite easy for him to cum between Astrid's gorgeous breasts. When he reached his violent orgasm, he quickly moved his cock up into Astrid's mouth, ensuring she would inhale all of his cum into her still desperately inhaling lungs.

She was now at the point again where her vision became blurry and she could feel her heart rate slowly coming to a halt. Hiccup now placed his ear on her chest to enjoy the sound of her heart desperately trying to keep her alive, slowing down to eventually come to a stop, leaving her floating completely naked and lifeless in the sea.

Toothless copied Hiccup's behavior on Heather, using her even bigger breasts to ejaculate again, depositing his still enormous load into her lungs yet another time to then place his ear on her violently thrashing chest, listening to her heart eventually come to a stop as well. He had to admit being aroused by this immensely, given that he was just barely starting to feel a light burning in his lungs while Heather just drowned in front of him, leaving her completely lifeless and exposed floating in the water just like Astrid. He enjoyed this so much that he decided wanting to see Hiccup struggle just like the girls, so he swam over to him to hug him in a tight embrace, pressing their amazing shafts together. Hiccup was amazed how he could feel every little crease of Toothless' muscles, but what astonished him even more was Toothless' clear attempt at drowning him as well.

This caused him to slightly panic, given that his lungs were now burning horribly, screaming at him to finally breathe again, but he didn't want to give in just yet, so he kept going. After a while, his body couldn't take it any longer, his chest intensively thrashing against Toothless enormous pecs. He finally understood how it felt like to desperately want to breathe again. He tried to think about something else but couldn't, his only thoughts: “Air, air, air! I neeeeeeed air! Just once! I have to breathe! Breathing, oxygen, precious life-giving oxygen, I need it! I have to inhale, please!".

And then he couldn't hold it any longer; his chest violently exhaling all of his completely used up air reserves to inhale again quickly afterwards. He had to admit how relieving it felt to finally inhale again, but this relieve didn't stay long, quickly being replaced by pure horror upon realizing that he was still not getting oxygen and was just inhaling useless water.

Toothless internally chuckled upon seeing Hiccup's cute desperate face that was now turning into a deep shade of blue, his chest increasing his breathing rate because it's used to doing this normally when his blood-oxygen-levels were too low, but in this case, it wasn't of any use to him, only causing his body to consume even more oxygen that it was already lacking, quickly resulting in his heart rate slowing down which Toothless was currently carefully listening to. It sounded so beautiful, feeling his steadily rising and falling chest, hearing how it was constantly filled with water again while his heart rate got lower and lower to eventually come to a halt.

Toothless was now left with three completely lifeless and naked humans floating in the water, their skins having adopted the color of the sea around them. He just couldn't hold back his urge to masturbate to the sight, loving the feeling of his gigantic cock himself, quickly masturbating himself to orgasm. At this point, even his body was starting to signal his desire for oxygen to him, reminding him it would probably be time to get all of them loose and back up to the surface before he himself became as lifeless as them.

So he quickly went to unlock the checkless, dragging them up to the boat shortly afterwards. He was extremely relieved upon seeing that soon after he laid them on the boat, they began violently spitting out the water, finally coming back to life again, soothing his worries he might have left them drowned for too long.