Seikou no Kiseki

The queen explains a ritual where, if the girls fuck the boy and he cums inside them, their abilities are increased, the girls accept and the boy says he also accepts as long as he can continue killing goblins. So, they all start to fuck, the guy penetrates each one of them little by little, always cumming inside them and showing a great stamina to be able to go on and on.

Each of the girls seeks to provoke him in a different way so that the guy can always continue, fucking them and cumming inside them to complete the ritual, even going as far as fucking the queen. But the guy only thinks of one thing, to finish quickly so he can leave and continue hunting goblins.