Is it normal to keep underwear that i found?

Is it normal to keep underwear I found? My parents have a vacation home and this weekend I had some people up for one of the nights. Everyone is pretty much single I had rooms planned out for everyone. We had a good night everyone helped me clean up this morning then left I went through the house again to double check everything because my family is heading here tonight.

One of the single girls is so hot we’ve been flirting a lot but we got too drunk last night and went our seperate ways to bed. She was sleeping in one room with the single queen bed when I was going through the rooms cleaning at the bottom of her bed under the sheets was her underwear I knew they were hers because every time she would lean or bend over they were hanging out. I guess she either always sleeps naked or kicked them off and was maybe rubbing herself?

Sitting in a quiet house alone finding the girl you’ve been trying to hook up withs underwear that she was just wearing the night before In bed you can’t help but let thoughts run through your head. I don’t know if this needs to be said but I masturbated with them I was so turned on I couldn’t help it after I threw them under the bed for now.

It’s kind of weird texting someone saying hey I found her underwear do you want them back? She might think how did I know they were hers? What am I going to do take a picture if she doesn’t ask for them I was going to keep them is that weird otherwise what do I do throw them away?