His mother

He sees his little sister running to their mother's car with her ballet things and his mother closing the door. He slithers down on her shoe up her leg under her wide skirt and under her panties into her vagina.

Feeling himself being human again but with a big weight on his chest and a feeling of absence where he doesn't have a penis anymore.

Looking down to see right into the clevage of his mother's top. Even seeing a bit of her bra.

He drives his 'daughter' to her ballet practise and heads back home.

Once there he notices that he is still alone.