Young woman one day walks in and sees her older brother getting a blow job from a woman. She can't see who the woman is but she is intrigued by the sight. She silently goes to see who the woman is. She is shocked to find it is her fraternal twin. Even though her twin is younger than her she felt that her sister was always the favorite and the prettiest. And sometimes feels bitter towards her sister. She still loves her sister and would do almost anything for her. Before she can get away her siblings catch her? She ends up getting talked into joining her siblings sex. We find out the sister has felt the same way towards the older sister, with the favorite and prettiest stuff. The oldest sister ends up getting pregnant pretty quickly, possibly from their first time together. BUT we find out the younger sister has been secretly trying to get pregnant for a long time. She may get pregnant eventually.