You and Erga are engaged, you love each other, at least that's what you think. You also can't wait to marry him, Erga also treats you well.

Tonight you just came home from work, you walk towards your room and suddenly you hear something from your sister's room. You approached your sister's room and peeked through the door, you froze in place. You saw Erga kissing passionately with your sister in the room.