My sister's bestfriend who i hate blows me all the time, is it normal?

Okay so my sister's bestfriend Jayla who I always thought was so hot, Has always been bullying me since I was a kid, I am 21 now. Two years ago year she came over to my sister's house (my house), and was acting weird and different around me. That day was a Friday and I had a busy day and was tired. So before I went to sleep (while everyone else was asleep, except Jayla), I was jacking off. I heard Jayla walking by and she goes "mmm", She opens my door as soon as I cum. She slighty exposes her breasts (and turns me on) and I help her get fully undressed. She gets on her knees and starts sucking, She goes "I know you want it". And we fuck... Now we do it all the time... Is that normal???