Is this rape or something? Need some advice... There's more to the story I'm just keeping it basic unless someone can help in PM or something

There was only a few of us left in the house and there was this girl who had been flirty to me all night and has a massive reputation for being a massive slut. Everyone was like passed out and shit and it was just us 2 awake, we got into the same bed but nothing had happened between us yet but when we got into the bed she started kissing me, I kissed her back and stuff and she asked me to fuck her but I said NO because

  1. no condom and she's known for being a dirty
  2. just had a knife held to my throat by some crazy dude
  3. no energy atall

She asked about 4x and I said no

I said she could suck my dick and I would finger her, or I already was fingering her I can't remember she said okay.

She went under the covers as if she was about to start sucking my dick, I felt the warm feeling around my dick but didn't think she put it inside her, I just thought she was good at blowjobs.. after about 2 minutes she pulled the covers off and revealed that she was actually riding my dick.. I don't know why but I ejaculated even though I went flaccid instantly after seeing, it didn't feel good whatsoever.

What is this classed as? I haven't talked to anyone about it and think this might be the cause of some bedroom troubles I never had before