>>2420541Flare's definitely the one who's gone farthest with Senchou other than perhaps Shion depending on what you believe really happened that night.
I used to think that Matsuri and Marine would be perfect for satisfying each others' desires, but I didn't know enough about them then. They're both way too shy. Though I think they've groped each others' boobs before, pretty sure Matsuri talked about that.