How do I catch my roommate? I think he has been pleasuring himself on my underwear?

Anonymous
Last week I was getting ready to go to work and found some stains on my underwear. I will admit I'm not the best at folding and putting away my clothes but I do wash them regularly. Last week I pulled a red thong out of my clothes hamper that was clean clothes, when I was un-twisting them to put them on I noticed it had a dried stain on it that I know was not from me. after taking a closer look it looked like dried cum. My roommate was the first person that popped into my head because I'm not currently dating anyone and no other guy has access to my room. I think I tried lying to myself by telling myself maybe it was just something that got put in the washer machine like Chapstick or something. I put them in the dirty clothes and got a different thong.

Yesterday afternoon I pulled in the driveway as my roommate was pulling out, I went inside to change clothes so I could go to a friends house. In a hurry I took a quick shower grabbed a black bra out of my underwear drawer without really looking at it and when I put it on I felt a really wet spot against my boob. I took it back off to see what it was and there was a huge wet spot of what was obviously cum. It was all over the inside of my bra cup and I could see it on my left boob like it was just put there. Now I knew it was my roommate, I quickly threw my bra in the washer machine and wiped my boob off with a towel.

I was pretty grossed out by this but I knew it had to be him, I would feel awkward bringing up the situation to him so I figured the best way was to somehow catch him so I could prove it. I don't really have any cameras or anything that I could hide so I was wondering if anybody had any ideas of how I could catch him?

I talked about this with my friend that night at her house and she was grossed out by it too but we did not know what to do.
How do I catch my roommate? I think he has been pleasuring himself on my underwear?
11 Opinion