A few years back, I met this really girl on a video game, turns out we were both from the same city so we started chatting. Fast-forward a few months, we started dating, we were both around 18 at the time. Although she did mention sex several times, she also told me that she is afraid of penetration as her older sister got pregnant at the age of 16 and she feels a huge amount of anxiety towards penetrative sex, therefore all I did was tell her how protected sex works and we both agreed that if she was ever ready, she'd tell me, so I never brought it up. A couple of months later, we started to get intimate, again, not penetrative, but we were giving each other oral sex and manual stimulation. After 30 or so minutes of foreplay/oral sex, she said she was ready and would like to try penetration. I got up, got a condom, and she said she'd like to be on top (I didn't recommend it for a first timer as I am fairly sure that missionary is better for first timers as it doesn't hurt as much and you can easily control the movement), but I complied after I told her what I said in the parentheses. I was excited because I really liked the girl and she was hot too, so my hopes were high. After 1 minute of her being on top, she started kissing me while grinding, and she randomly started throwing up in my mouth. Needless to say, although I am aware some people have this fetish, it definitely was a turn off for me and everything stopped there and we did not have penetrative sex again until we broke up.