@Seraphy think of the situation, he tried to prevent the possibilities of the rape before her being captured, so he has to play it carefully. He's trying to gain info to get his sister back and instead of viewing it as him gaining resources you view it as him pleasuring himself instead.
@https://mangadex.org/user/108122/eggie
That's why he's the best MC, thinking with emotion increases the chances of failure when it's not used in the correct situation.