So story if I remember has Hero siblings, a brother and sister, and the brother has a ridiculous sex drive, to the point that a woman fucking him will basically be driven insane. His sister is like “Lemme ride that” and he rejects her because he’s not into incest. Instead, they get an Oni Maid who’s like “I can take that” and she takes shockingly well for about like…10 minutes?
Then the brother gets serious and she immediately gets blasted and nearly faints, but somehow stay conscious for a bit. After battling for several hours, Oni Girl finally gets knocked out while the Brother continues to relentless drive into her. She wakes up and shockingly is mentally fine, but asks something along the lines of “Maybe not every night”