No, You only desire one girl.

"Sorry, Diddy" You smile weakly "You are hot as hell and hour ago I would have fucked you as much as you'd like. But first off, this is no porno movie, I am exhausted and second..." you gently kiss Lexi on her lips "I love another girl and I intend to be her loyal boyfriend if she so desires."

"Are you sure?" Lexi asks with a big happy smile, "Diddy is so hot, her tits are gorgeous, and I don't really mind if you'd make her happy."

"Yes, I am sure. You are both hot and very fuckable, But I love only you, love you more than a sister. And don't want to complicate things." You kiss Lexi once again "Do you want to be my woman, Lexi?"

Lexi nods happily while Diddy exhales sadly, "I am happy for you Lexi. But damn, Why can't I get my share? Now I'll lose both my best friend, who will spend all her time with her hot step-brother, and a chance to fuck one of the nicest guys around..."

"No, you are wrong, " Lexi tries to calm her friend down but to no avail, Diddy is on the verge on crying.

"No! It's true! Now when you have him around you'll never participate in our lesbian experiments. And you won't need me anymore to create all those 'seduce my hot brother' plots." She's now sobbing, should you try to calm down her down somehow or let Lexi do that?