I should note that Soleil isn't Class-S at all, because that would involve actually having a relationship. I think that one guy was thinking of 'Bait And Switch Lesbians' instead, which is a fair deal more accurate, but isn't particularly liked in Japan. It's popular with WRITERS but isn't actually a thing the LGBT community actually likes, since you know. They prefer the real thing.
Soleil is just terrible because every single thing about her is 'likes girls', even the two known S-rank supports she has with men are "I fell in love with you because I thought you were a cute girl/you were a cute girl for a moment."