I got myself into a bit of a sticky situation with my wife’s sister! So my wife was at work and asked me to drop off something at her sisters house, so off I go to deliver said item and when I get there she invited me in for a drink because she was home alone and bored. After about an hour or so of chatting and having a drink I noticed she’s gently rubbing my thigh with her foot which immediately made me rock hard because I have a feet kink and her’s are sexy as fuck. She noticed the bulge in my jeans and smiles at me before starting to rub it with her hand. Now I don’t remember how it happened exactly because it happened so fast but in what seemed like seconds she had removed her shirt and had her 38GG’s out and took me in her mouth. After a short period of time we’re both naked and fucking furiously on the couch after only a few minutes I was about to cum she shouts at me to pull out and finish on her tits which I did and made a big mess. She quickly disappeared to the bathroom and when she returned she told me to leave and that we should “forget it ever happened” problem is I can’t forget about it and just how mind blowing it was. There’s never been any sexual tension between us at any point or even sexual attraction towards her but holy shit it was good