It turned them both into futas.

Hiccup's whole body felt strange. From his head to his feet, his insides and outsides had this tingling sensation, like when one's foot falls asleep. He was not sure if this alien feeling was pleasurable, uncomfortable or torturous.

Almost no having noticed, he felt his shirt become tighter around his bosom. His hair grew longer past his shoulders, and he felt his face become less angular and more soft. The feeling in his loins were especially strange, blood flowing to his penis as it suddenly sprang to life with no ****, with another strange, alien sensation invading his privates that he still could not describe.

"W-What, what happened?"

Hiccup suddenly reached for his throat. His voice sounded different. It sounded much higher and less like a boy's, almost like...

"Astrid?"

He looked for the shield-maiden, having remembered that she was caught up in the explosion too. She did not look very different - aside from a number of tears in her clothes brought on by shrapnel, but she definitely was acting strangely. Her breath labored, her cheeks red as her hands were violently playing with her still developing breasts through her shirt. One of her hands ventured down to her skirt, desperately trying to get between the spiked, leather exterior.

Hiccup tried getting to his feet, struggling to adapt to his shifted center of gravity while trying to ignore his throbbing erection, becoming more and more **** for release. He toppled over in front of Astrid

"Astrid? Astrid, what's wrong?"

Astrid looked up to him, her eyes glazed with a pleading filter Hiccup has never seen on the blonde, before she suddenly grabbed his face and suddenly connected in a deep kiss. Hiccup always dreamed of kissing Astrid, having had a crush on her since they were little, but he never tried to chase that dream since Astrid clearly had other things on her mind.

After enjoying the kiss fora few extra seconds, Hiccup came to his senses and separated the kiss.

"H-Hiccup, what's happening to us?" Asked Astrid, her voice sounding like she could burst into tears from some form of agony.

"I don't know Astrid, I don't--" before Hiccup's brain suddenly shut itself off when Astrid raised her shirt just below her neck, exposing his crush's tits right in front of him.

"These clothes! I feel like I'm suffocating!"

Astrid lost what little patience she had with her sudden lust-induced rage as she gripped her skirt and, with an almost inhuman, berserker strength, tore the sewn leather open with a **** so hard that it tore through the front of the thin garment beneath, revealing her exposed cunt and a tall erect cock placed just above it.