The girl you confess your feelings to shows no interest in you whatsoever. Grudgingly... you resort to the other method at your disposal. To use a hypn*sis app to modify her common sense, and corrupt her into your own personal sex sl*ve.
One day, the Young Master (you) helps Ayame, who has collapsed in the rain. She feels a sense of deep obligation and respect, so she vows to serve as maid and stand-in sister for the Young Master. But when the secret she kept hidden away is revealed, she is filled with guilt and self-loathing, seeking punishment and redemption.
One day, while dozing off in the living room, you wake up to a strange pleasant sensation emanating from your lower body. It seems your little sister was sucking your dick and carefully cleaning it with her tongue and lips...
In the near future the declining birth rate has proceeded beyond the point of return. You, the protagonist, are a modified human who has undergone DNA engineering to maximize fertility. Use your super semen to impregnate all the girls!