Desire my MIL

My mother in law and I have been mistaken for husband and wife. I think that got her a little excited, I know it did me. Has anyone else desired a chance to please his MIL? My wife recently went thru her underwear drawer and gave her mom some things that don't fit anymore. Some of those things I've used while masturbating and I know my cum was on several of those items. Hope she wore them without washing. The idea of my cum anywhere near her private parts makes me hard just thinking about it.