I see, He's trying to sow discord between the siblings. Once the sister tastes freedom, she won't accept being caged by his brother anymore. Like they said, freedom is the sweetest nectar
Man, I'm really glad that we have some good Milf stories. From reincarnated as MC at NTR doujin, Stealing hero's mom (and more), that mischief leprechaun or something, and this. So happy
Probably something like this. I don't have any experience with love either, but it seems like this meme is kinda true for man at end of relationship (according to 9gag community at least)