Sibling Rivalry

Dr Darke snapped his fingers and brought Molly and Mandy out of trance. He could tell instantly from the way that his suggestions had the intended effect on them both.

"Okay girls. I want you to both tell me about your favourite sexual kinks, one at a time. Molly, you go first."

"Well, I love sucking cock on my knees. I also think it is really hot when I get spanked then fucked ass up, face down. You want me to show you? I find nerdy guys like you so sexy!"

She began to undress. Suddenly Mandy looked over at her sister and, with a look of pure envy on her face also began to remove her clothes as quickly as she could. She also seemed **** to tell the doctor about her own sexual preferences.

"Nerdy? He's, like, super athletic. Anyway, forget that skank. I like to suck cock on my back and I love riding cock cowgirl style. Come on, let me ride you doctor!"

"Quiet bitch!" Molly was now face down with her ass pointed up at Dr Darke "Forget her, spank me hard then fuck me from behind!"

"Forget her, you know you would rather have me ride your dick, doc!" Mandy was naked, on her knees and beckoning Dr Darke towards her.

How was he going to handle this?