At the gym today

After my workout this morning at the gym I went for a shower as usual. When I went to hang my towel up there was a pair of CK boxer briefs which had obviously been left there over the weekend. I hung my towel next to them and then when I'd showered I grabbed them and put them in my bag. By the time I was dressed I was as horny as fuck. So I went into the toilets and wanked over the briefs and covered them in my cum. I've still got them. Not sure what to do with them now. Part of the excitement was not knowing what the guy who wore them looks like. I've never done this before. Has anyone?