You tell Emma you'll only do the threesome if you can fuck the mystery woman's ass

You tell your girlfriend that you'll agree for another threesome with this mystery woman - who you know is actually your sister - if the mystery woman gives up her ass to you.

Emma's eyes go wide and she stifles a laugh as you tell her your demand. She has no idea that you know it's your own sister's ass you're asking to fuck. She doesn't know how depraved you can be.

"Are you sure that's what you want, John?" Emma asks. You assure her that it is.

Emma assumes that your sister will turn down the offer, but later when she texts your sister your condition it's not the immediate deal breaker she thought it would be.

"Are you sure there's no other way?" your sister replies?

"I tried to talk John out of it... but he was firm. Your ass or no deal at all." Emma explains.

The three dots appear in Emma's phone while your sister types and un-types her response.