Caught pretending to be my Sister (with her boyfriend!)

I was in my sister's apartment, in her bed with her boyfriend letting him fuck me when the real Rachel walked in! "Oh shit!" I explained, "It's Rachel!"
Her boyfriend does a double-take and says, "What? I thought YOU were Rachel!"
Rachel was totally pissed off and yelled, “Oh my actual god! I can’t believe you couldn’t tell you were fucking my BROTHER!”
“BROTHER?!? But… She… he… she… looks just like you!” he sputered, but then looked down at me and said, “But I should have known just because you’re never this into it!”
I was trying to appologize to my sister for pretending to be her… “I’m sorry… I found this medallion and it turned me into Rachel and then… mmm it felt so good when he thought I was you Rachel… It’s not his fault…”
“You know what?" she fumed, "You two deserve each other… you stay here and be Rachel and I’ll move into your apartment so you two can fuck each other whenever the fuck you want…”
“Sounds good to me, SHE’s a better lay than you ever were!”
“I am?" I moaned… "Mmmm… slip it back in me, lover…” god it's good to be Rachel!