In the end, Double Leaf left, carrying a deep resentment and dissatisfaction, glancing back every few steps as she walked out of the bedroom under the watchful eyes of those two lovers on the bed. She didn't try to leave any detection spells to continue gathering information, partly because Diana would certainly notice those tricks, and partly because even if completely flustered by the new intimate encounter, Diana didn't notice, Double Leaf still didn't want to witness… or hear anything eighteen-plus about her half-mentor.
It's not that her nonexistent morals suddenly came online, but simply to protect her young and innocent heart. After all, it's different from watching manga or anime; Diana is the person she has been together with day and night for months. If Diana really planned to do something unsuitable for children, Double Leaf felt she might not be able to handle it.
In short, she was sent away just like that.
