Cheater Ex Turned into Your GF's Clone

A couple of months before you and your girlfriend got together she found out that her boyfriend at the time had cheated on her. Today is finally time for a proper revenge. Your girlfriend invites her ex over "to fix things up" but uses a mysterious mixture to change him into her clone. Her ex is a girl now! And looks exactly like your girlfriend. You happily show up to do that transformation justice. The ex is really mad to be in a girl's body but complies to give you a head just to be changed back as soon as possible. She hates it and tries to apologies over and over but you and your girlfriend are enjoying yourselves. She can't stop touching herself and you get super hard. The ex is ready to be done but you throw her on the bed and you fuck. She doesn't want to admit it but she starts loving it and eventually cums. Your girlfriend is shocked because cumming means she can't change back! The ex is appalled but it grows on her. Screw that! She came, now it's time for you and your girlfriend. You end with and creampie and she masturbates herself to a huge orgasm. Your new sex toy thanks you politely for making her your little cum slut.
Some time later, your girlfriend and her slutty clone argue over who's gonna suck you first. You're really satisfied to have them two in your life right now so you say they do it together. They take turns giving you a head and you cum on their faces and they love it. Time for a threesome?