The game of "I Never..." ended in incest with my stepbrother.

Juniper was bored alone in her room, so she went to her stepbrother to play something with him. They came up with a game called "I Never...", the rules of which were extremely simple: one person says something they have never done, and the other confirms or denies it. And everything would have been different if the little sister hadn't said, "I've never thought about incest"... but her brother couldn't say the same. It was the first step towards their family sex.