Too vague. Marisa was pretty boss despite being repeatedly NTR'd, but what did Reimu mean about knowing how Alice was feeling.
I was confused too, so I went back and reread Reimu's interaction. She seems strangely consensual in this situation; if it were ReimuxMarisa and she "caught on quickly and cooperated", even more so. Then there was:
A: It was me. I'm the one who asked her.
R: ...Alice. I--
A: You had nothing to do with this... this was my own selfish request.
Reimu's reaction was odd; it seemed to imply that she believed Alice made the request with her in mind as well, which in turn, coupled with:
R: It's okay though... I understand all too painfully how she feels as well. How unfair it can feel... right, Alice?
seems to imply that - assuming her empathy is interpreted as "unrequited love" - Reimu --> Yukari. The way Reimu embraces and pleasures her hints faintly at this, although maybe even when not under influence, Reimu can enjoy it.
Too vague, so all of this is just guessing, but at least I don't think it's Reimu --> Marisa.
