She literally tears his clothes off and fucks him dry.

Astrid, too drunk on lust to care about her naked body and raging hard-on of her immaculately-grown cock in front of the chief's son, immediately shoved him to the ground as she pulled off his pants, vest and shirt.

"Astrid, please, wait!"

His pleads went on deaf ears as by the end, he was completely naked. To his shock, his body changed even more than he could have predicted. His lanky, stick-like body was suddenly curvy, his hips having grown to Astrid's proportions. Whatever body hair he had on his stomach was completely gone, his belly, shoulders and legs having become soft to the touch. On his chest he sported a pair of breasts with cherry-red nipples. The only thing that has not change was his cock, standing straight up with tufts of dark-brown hair surrounding it, but even then he realized that 1) his cock has grown a few inches taller than before, and 2) his balls were missing! He knew that it was replaced by something, but before he could check, Astrid jumped onto him and placed her mouth over one of his nipples and started sucking, tweaking his other nipple with her fingers.

Hiccup's erection twitched as he moaned loudly in his new girl's voice, feeling sparks of electricity jump all over his body with every stroke of Astrid's tongue and every pull. Already growing bored of foreplay, Astrid spread Hiccup's legs as far as she could and placed the tip of her cock where his testicles used to be and suddenly shoved, penetrating his body.

Hiccup felt a barrier break in his loins, a powerful shock of agony throbbed in his loins, blood coating Astrid's cock as she stole his virginity right there. Tears pored out of his eyes before the pain subsided, the pain suddenly replaced with ecstasy as every movement Astrid's cock made inside him became wonderful and filled with pleasure. Hiccup's eyes glazed over the the same lust-filled tension Astrid was controlled by as Hiccup grasped at the grass, Astrid burying her length into him to the hilt before moving it out and back in fast and hard. Hiccup cried out when Astrid grabbed his cock and stroked it violently, gripping it hard enough for it to break as she did with her axe.

"H-Hiccup! Hiccup! I feel... something... coming!"

Without warning, Astrid's seed shot out from her cock and flooded Hiccup's insides in a white-hot flash. She came so hard that one would even think that Hiccup's lower belly inflated slightly as her cum flooded out of his body. The sensation of her touch, as well as the strange and powerful orgasmic feeling he felt in his new, no-longer-virginal pussy, causing his own seed to shoot out, coating his stomach in cum.