Thanks for the chapter!
For those unfamiliar with term THOT, it's an acronym for That Harlot Over There.
While the sisters have a point where someone's liable to use him to death, what's to say the two of them aren't going to keep him as a tool/pet and only use him almost to the point of death? In any case, the sister was right about him raising a flag at the end of the chapter. It's funny how they were never able to get past kissing him before raising a level. Hopefully they wake up and take out Mr. Doesn't take No for an answer before he ravishes the MC.