I VERY MUCH prefer to have a guy ejaculate his semen inside me. I'm 27 years old and consider myself bisexual, though I lean more towards boys than girls. My first time bottoming I was a senior in high school and the guy that I had sex was a sophomore. We were at his house in his attic bedroom and he didn't have a condom to put on. I told him I was a virgin, with both boys and girls, and had never taken another boy's penis in my bottom before. He said he'd only bottomed but that he knew he was clean, so I told him he could fuck my bottom as long as he pulled out before he ejaculated his cum. He ended up fucking me raw in a few different positions for about 30-45 minutes. Towards the end I knew my own cum was about to blow out of my cock, so I moaned loudly and let out flow all over my stomach, chest and neck. Just as soon as I started cumming, his throbbing penis started ejaculating and pumping his load into bottom. Feeling his cum load hit my prostate as he continued to plow my hole felt absolutely AMAZING. When he pulled out, some of his semen dribbled back out of my bottom and onto his dick, which he promptly pushed back inside me. After that he pulled out of me, then took my white briefs and cleaned off his pretty cummy cock and started wiping the excess cum off my bottom and butthole. Then he threw my briefs at me and said "okay we're done, you can go."
I left his house completely filled with cum, half of it oozing back out of my hole into my tighty whities.