YaSi666's manga / #Isekai(3)

Homegirl gets run over by truck~Sama, and is reincarnated into the middle child dukes son. What more is that he's one of the villains from the romance story he read in his past life. The one who's a walking death flag, because of the protagonist. What to do when the ML has to help our protagonist get rid of a magical curse through the sharing of fluids.

The seme was so cute and uncool, get reincarnated into a manga he drew and ended up as a rival. But... He won... So-