Came in her panties while they were gone

So this happened not long ago and I have a feeling it’s going to happen again very soon.. my wife’s best friend was visiting. I’ve had a big crush on her for years, even before I started dating my wife. We’ve been friends a long, long time. Well anyways, they had gone shopping at Target and to get lunch, leaving me home alone. I walked down the hall and noticed that she left her dirty clothes in a pile in the guest room but the door was open. Curiosity got the best of me and I looked through the pile and found her underwear that she must’ve just been wearing because good lord they smelled strongly like pussy. I immediately got hard and started stroking with them, eventually cumming in them. Well, I didn’t know what to do next. I knew they would be home before too long so I quickly rinsed them out and threw them in the dryer for about 20 minutes which was going to have to be good enough. Took them out, put them back to where I found them, and tried to look inconspicuous haha. They walked in the door maybe 10 mins later, having no idea what I had been up to not long before. Well, maybe she did but she hasn’t said anything. She’s visiting now until new years so I can’t wait to snag a pair again and do it all over again. The temptation is just too strong!