My brother has been masturbating with my panties

It happened almost 2 or 3 months ago-ish.

I have my own laundry basket, I usually put it in the laundry room when it's almost full. That means multiple panties and bra would be in there

One day. I went and put my laundry basket as usual, after I came back to my bathroom again, I noticed I left my dirty t shirt on the floor, I did my business then I picked it up and walked back to the laundry room.

I froze in my tracks because I saw my younger brother, who is 20, snooping through my laundry basket. I was like wait a min, why is he going through my basket. I went back to the bathroom, closed the door and started peeking through. He came out the laundry room, holding something under his t shirt, he looked around then rushed to his room.

I made my way over and tried to slowly open the door but it was locked. I have no idea what else he did with them but I know he cummed in them. I waited patiently, finally heard the door unlock. I snuck around, saw him bury those used panties and bra deep under the clothes in the basket.

I hid again and checked when he left. They were used, fresh cum on them. That turned me on so much that I took those panties to my room, closed the door and rubbed them all over my pussy while masturbating

This has happened more than once, I have never caught him using those panties cause his door is always locked. I feel like confronting him but I'm nervous.