When she has no clue
I'm straight, but I always think of girls constantly. If you're a girl and walk in front of me, I'm thinking about being with you...so maybe I am bi, ha.
Anyway, about my friend, let's call her 'Beth'. She makes me so horny all the time, but she has no idea. I act so straight and we've never talked about anything sexual. My nipples get hard and my pussy throbs whenever she's lying next to me when we have a sleepover.
When we talk in chat rooms, I always say stuff that seems normal, but has some sort of hidden meaning for me and gets me off. I feel myself up and jill off when I am talking to her. I love doing it without her knowledge. She'll find out soon enough, though.