This happened a long time ago with my ex-SIL, but I still think about it all the time.
My ex-wife’s sister, Patty, and I always had an unspoken thing between us. I don’t know what it was about her, pheromones maybe, but every time I was around her it was like she just oozed sex out of her pores. There was always this sexual energy/tension between us that neither of us ever directly acknowledged, but it was unmistakable.
One night my ex and Patty went out for a girl’s night. I was enjoying the Friday night to myself, playing CoD and getting drunk. Finally they came home around 2 and were obviously pretty drunk. Patty came in a sat really close next to me and said how much she wished I had gone with them, I would have had so much fun, etc. I loved being close to and smelling her.
Anyway, we all talked for a while and they were both ready to sleep but I’m still having fun gaming. So I tell Patty she can sleep with my wife in our bed and I’ll just pass out on the couch. I gave her some privacy to change into a lot of my wife’s PJs and we all said good night. They headed off to bed and I headed back to the couch to do more battle.