What the hell? From seeing rose naked once she felt the same way when she sees casmin whom she loves and knows for so many years??? He just got got his wife in love with his sidewhore just like that??
No, that scene was meant to portray Elena being sexually excited from seeing Rose's body. Showing that Elena is bi, this doesn't mean she loves Rose she's just inexperienced and got slightly horny seeing a hot female body, simple as.
I'm going to make you write more chapters by spotting errors.
I like what you're doing with Rose, not sure what you plan to do with Elena though
I especially like you making characters other than mc explore their feelings