(Much) Older Lady

My wife's best friend lives in another state but her mom "M" lives nearby. M's husband died earlier this year so I've been helping out walk the dog. I go over there twice a week and stay there sometimes to dog watch when she leaves town.

It wasn't long before I started feeling very attracted to this woman probably in her late 60s. She has long grey hair and is pretty and thin. One time I stayed over when she was on a trip I got drunk and jerked off while rubbing her panties on my face and cock. I decided I had to cum in the panties and put them back, thinking that was so hot and risky. After I unloaded an obscene amount of seamen into her underwear I panicked. I calmed myself and followed through with the plan, sticking them back in the panty drawer.

The next time I saw her she was like so did you spill something in my room you want to tell me about? I denied it but she goes on to say that basically she knows someone 'ejaculated' in her underwear, and it was either me or someone who broke into her home which she wanted to rule out, obviously. So with that I admitted that I was drunk and maybe did that. She's like ok well, next can you just wash them? I almost laughed but I agreed.

So fast forward to last weekend when I dog sat for her again. I go into her bedroom and there are like 3 or 4 panties laid out on the bed with a note that says:

These are old. You can throw them out afterward. P.S. they're dirty. Heart

I came so hard with one o my face and another wrapped around my cock. Now I need to figure out how to cum on a pair that she's wearing.