POV: i am your wifes sister and we were at the same yoga class [i am wearing my yoga attire]. We stay 5 minutes after class is finished and the yoga studio is empty. i see you staring at my tits and notice a bulge in your pants. i comment on how watching you do yoga has made me really attracted to you. i tell you i always wanted to touch your cock, and its not cheating because its in the family, right? So i make you take your cock out (dildo POV handjob) and am so excited at how hard you are. i stroke you with my hand and do a little dirty talk about how i can't believe i am doing this with my brother in law, etc, i am your my wife's sister, etc, and then i ask you if there is anything else i can do to help you cum. you ask you if you can play with your nipples, and i say thats cute, of course you can play with your nipples while i stroke your cock. Then you ask if you can see my tits. i giggle and say of course and get them out for you. i stroke you and tell you to play with your nipples and cum for me, and i go faster and faster and make you cum between my tits . i am very happy when you cum and say wow you must have really needed to cum, lets not tell your wife about this. ;)