Sex dream about a girl I dont like...

Date: 10/11/2019

Background: There's this girl I'm not attracted to, and I dislike her personality a lot (rude, annoying, manipulative, etc.). Still, she has a major crush on me and is obsessed with me and always tries to make the conversation about sex and sexual topics in real life. In my dream: She was laying on this bed, and I was laying on the floor right beside the bed in just underwear and a t-shirt with a blanket half on me. For some reason, I have an erection, and she starts trying to make out with me. She climbs off the bed and gets on top of me and notices I'm stiff and gets turned on. I try to use the blanket to cover myself to try to prevent her from touching me. But her hand pushes through the blankets, and she grabs it and starts commenting on how nice it is. I didn't want to have sex with her, but I couldn't deny her touching it felt REALLY REALLY good. So I just let her and pretended I was trying to push her off, but I wanted her to keep going. She put it in her mouth and started moaning, and I began to groan to; it felt incredible. Then I woke up incredibly horny... Why would I have a sex dream about someone I don't like in that way? Does anyone relate?