Emma surprises you with a second threesome a few weeks later.

You've been a little bit down the last couple of weeks. Emma has been keeping her sessions with your sister a secret, so as far as you know, she turned you down. Seems your sister wasn't nearly as pervy as you had hoped, and even daily blowjobs from your beloved slut can't keep you from wondering: what if, what if. But, little do you know, your sister's anal training will soon be ready for her first test.

You arrive home from an outing with your friends, finishing up your designated driver duties, and you've worked up an appetite for your woman's sweet pussy. The house is darkened when you pull up, and you assume she's already gone to bed. No matter, you figure, you'll just wake her up. But instead, when you open the front door and walk inside, she's already waiting for you, walking up to greet you in a tank top and panties. She greets you with a kiss, and you pull in her delectable ass with both hands, but she softly stops you.

"There's a little surprise tonight, John. We were waiting sooooo long for you." Who's we? When you see Emma produce a black blindfold, though, you put two and two together. Your sister said yes to anal sex, she's somewhere here, ready for you. Your cock gets thicker and thicker, imagining the feeling of penetrating your sister anally, as Emma secures the blindfold around your eyes, before taking you by the hand and leading you on, whispering as you go.

"She's so excited to have her first time with you, John. She told me she wants it really rough and nasty. We're both happy to do whatever you want, sir." Emma really is going out of her way to make this a special event. She's never called you 'sir' before, and you like it. Suddenly, you realize something. She's not leading you to the bedroom...