Let's live alone for a while...
Until Ayane is the only thing you can think about...

Ayane, the younger sister who loves her older brother Tomoya so much,
lets her love for Tomoya get out of control and ends up doing ____ to him!

Not wanting her childhood friend Sayaka to take him away,
she restrains him and gives him her virginity in a sort of reverse rape,
and then begs him to have sex with her to make a baby so she can become Tomoya's wife!

[From Getchu]