Lol.
I love how everyone knows Yakumo can't be trusted. Literally tied the poor girl up.
Now that I think about it, this is actually a refreshing change of pace. Usually, if there is a lesbian/bisexual in a harem manga, she's the one getting all the action with the girls while the MC just sits in the corner like a cuck. But here, it's the complete opposite.
Pretty based if you ask me.

(Edit: That being said, I'm not against adding her to the fun

.)