Atleast he got some spine and giving some good reason. Spineless nose-bleeding MC is soooo Heisei era. Also there is a technology called contraceptive.
Even though this is a certified dumpster fire, it was an entertaining one. But i wish author atleast show us more conclusive ending. Welp it is what it is
You know, there is a reason why incest is shunned, the outcome is higher risk of deformities/genetic illness. Idc if they have relationship, but please dont have kids.