First time I had my ass fucked

I experimented with men 3 times in college, the second one was a black guy, cafe aulte color with a small afro. I was taking a break from studying in the library and went into the men's room to masturbate. He stuck his head under the stall and I saw the afro and got rock hard. I turned for him to see me jerking off and he put his cock under the stall and did the same. I went under the stall divider and got on my knees to suck him off. He was shaved and surprisingly had a thin short cock only about 5 inches. After he came and went to go down on me some one came into the adjacent stall so I told him let’s go to a quieter place I know in another building. We got into a stall and took off our clothes. He got down on his knees and sucked me off and then turned me around and fucked me in my ass. It was funny because while I was walking every step felt like it was squishing the cum out of my ass and I was afraid of a wet cum mark as I went back to the library