This is indeed a lucky day for the boy when he came to his girlfriend's house and coincidentally had sex with her sister. It must be said that the little sister is too naive, completely trusting her older sister while she is extremely lustful and cunning. The moment the little sister was busy, the older sister took the opportunity to seduce the boy. Being young, it is very difficult to restrain oneself from temptations, especially sexual ones, so he cannot be blamed. If anyone is to blame, it should be himself first, having a girlfriend but not knowing how to maintain the relationship, always being lenient and the consequence is the appearance of a new part on her body, which is horns.