Game mechanics are pretty dumb, but just about all authors are in love with game mechanics in isekias, so whatever.
It was fun him beating on her ass. Be even more funny if she secretly enjoyed it and comes back for more.
Its not good, but its not terrible, so I guess its readable.
I am however, actually surprised he didnt think he was a boy... Then after she got out of the bath he would of been like ~looks~ oh your a girl!. Normally how it goes when MCs pick up tomboys or traps.