Jealous brother has sex with sister and therapist to get over

I’ve always had a very special relationship with my sister. I mean, we did everything together—or at least we used to, until she got a boyfriend and decided to spend all her time with him. Now, she really wants to go to therapy on her own. No way, I had to go with her. The therapist made me realize how jealous I was of her boyfriend and tested me by making me fuck my sister. But then, he said he’d help us share again, so he sat between us and pulled out his long, hard cock. If this is “sharing,” maybe it’s not so bad after all.