Hi there, I'm looking for one particular manga where a girl and an indifferent bored boy have sex at his or her apartment every now and then. As far as I remember there were no action, superpowers, etc. just slice of life and maybe ecchi. At one point she asks him why is he with her and he says "because you have a hole". Help?

Umibe no Onnanoko?

Yes, this is what I've been looking for, thanks!