Left Panties Out for Son

Confession: My husband and I were going out of town for a few days and I left my 32 year old son in charge of coming over and feeding our dog. I left a pair of my panties out on the floor of our bedroom (making it look like I accidentally left them there) to test him, to see if he would move them (I memorized exactly how I left them), or do something even more extreme. I was just curious. When we got back from out of town, the panties were back in my underwear drawer, and they were so crusty I knew he'd come in them. I put them back on and masturbated and had maybe the best orgasm of my life.