Giving anonymous oral sex as an undergrad away at school

I was 18 years old and away at college. I was at library and like most 18 year old males I was horny. I couldn’t study so I went to the bathroom to masterbate. I went into the stall and started to do it when I realized there was a hole in the wall to the next stall. I had never heard of the term “glory hole” till years later. I was embarrassed and almost left but I acted like I was actually going to bathroom. While I was sitting there I realized that the guy in the next stall was playing with himself. I started to watch him and it turned me on. My best friend and I had experimented a little in high school with giving each other head (never to completion). He caught me watching him so I stopped looking and stared forward. He then touch my foot lightly under the stall with his foot so I touched him back. The next thing I knew, he stuck his dick through the hole (it was pretty big). I hesitated for a second about what to do but I was very horny. I started to lick his dick and then went into giving him head. I sucked him till he came which actually didn’t take too long. I immediately left after he came because a part of me couldn’t believe what I had just did. I went back to my dorm room but was so turned on by what had happened. I couldn’t get it off my mind. So the next day I went back to the library. I went to the same bathroom and saw someone in the same stall as the guy the day before. I was instantly even more aroused. I went into my stall because I thought it might be same guy back for another one. But it was a different guy and he covered the hole with toilet paper. I was disappointed and debating about what to do. Do I masterbate there? Do I leave? Well then the toilet paper came loose and fell from the hole and there this man was masterbating with the biggest, thickest dick I’d ever seen. He was getting into it apparently because he didn’t put toilet paper back up to cover hole. He noticed me watching and kinda turned to face me still stroking himself. He then leaned toward hole and said “hey kid, wanna suck me off?” I nodded yes and then he stuck his dick through the hole. I used both hands and still had a mouthful. I could hear him moan and worried for a second that people would hear but I was so turned on, so I kept sucking him. He shot his load and then took off before I could even grab my backpack. I tried to find him and ask if we could maybe meet again but I couldn’t find him. That was last time I went to that library bathroom. The guilt just got to me and I couldn’t believe what I had done. It still turns me on to think about those 2 days. I have NEVER told this story to anyone!!!