My first gay fantasy and anal sex experience

So I’ve always thought as a teenager I was straight as they come but in my late teens I noticed some fantasies entering my mind about mm sex encounters. My first vivid one was when I was 16 waiting for my school bus at the bus terminal. I went to use the male toilets as I was busting and my trip was a good hour. I used one of the cubicles as a shy teen and as I was peeing I saw all the writing on the walls about mm sex meets. I got aroused but left to go back to wait for my bus. The messages on the wall were still in my head and I found myself imagining a guy coming up behind me and rubbing my cock before dropping my shorts and fucking my tight virgin hole right there and then . this got me so horny that I rubbed my cock in my shorts until I filled my shorts with cum. I got the bus home with cum filled jocks wondering what just happened. Dial forward 5yrs and I realised that I’m desperate to be fucked by a guy as the thought of being a btm is a massive turn on and my desire. I found this guy in a forum and we chatted before meeting, he was tall masculine and had a few tattoos, we met at his apartment me nervous as hell him cool as, we chatted for a bit before he suggested we head to his room. Not long after we are both naked on his bed with him dominant and sliding his hard body over mine. With each slide his legs spreading my thighs open more and more so he could access my arse. I felt nervous but excited as I’m finally going to experience my fantasy. He rolled onto his back and lubed up his cock and my tight arse before positioning me cowboy on his massive cock! I felt this massive pressure against my hole before his head entered me and it hurt like hell. He thrusted into me a few more times and I wondered when the pleasure I imagined would start if at all. After riding his cock for a while he moved me to being on all fours and entered me from behind doggie! From the moment his cock entered me it felt INSANE! every inch inside me was intense and amazing, he grabbed my hips and pounded away as I was smiling and enjoying every second until he came which was disappointing because I was just loving being fucked by him and could have gone for much longer That was the moment I unlocked something I can never close as I love being a btm and have enjoyed many a session with guys and male couples alike. So glade I did it.