Roommate fucks me standing up, I cum on her bikini

I was sunbathing a little on the terrace, when I got home she told me that I had to put it in her no matter what, that she's liked me for a long time and that I had to put it in... it left me frozen to be honest, I didn't think a girl like her would want to have sex with a guy like me, so she grabbed my cock, pulled down her bikini a little and while we were both standing we fucked in a great way, I came right away, fuck, I'm not used to these things.