It only happened once

I (M25) was at a party with friends and there was a new girl (F27) in our group she and the girl (F26) who invited her wanted to use my phone to take a picture cause they left their phone in the car. When she (F26) gave me the phone back she said „make sure to delete those pictures after sending them to us or your gf will think you are cheating“. She said that with a smirk across her face the new girl laughed and asked the my friend something I couldn’t hear. The night was progressing many drinks later in the dance floor she was dancing next to me she was looking at me pretty often every time our eyes found each other it was a very deep look. I went a bit away from the dancefloor to smoke a cigarette she joined me and we sat down on a bench and talked for like an hour she suddenly leaned over and kissed me I didn’t resist I was melting into that kiss. So forbidden so much adrenaline but it feels so good at the same time. She was really aggressively kissing me. I told her I had a gf she said „I don’t care what happens here stays here“ we went to her car and fucked in the car I licked her she sucked my cock as deep as she could. We fucked she kept telling me „you fuck so good“ she wanted me to go harder and faster. She was masturbating her clit with one arm while I was FUCING her from behind grabbing her breast. She came which made me cum. Luckily I was wearing a condom which in the midst of everything she somehow made appear of nothing. She smiled and kissed my body she said it’s said it’s going to be over from now but that’s life.