Check on Lilly

I guess I’ll see what Lilly is doing. I’m not sure what that wink from Ashley was about though. She was acting odd for some reason. Anyway, I think I’ll surprise Lilly and sneak up on her.
As I walk to her room, I see her door is cracked open. That means she won’t hear me opening the door. She is so in for a big surprise when I jump out at her. Laughing to myself I reach the doorway. It’s then that I notice a low noise coming from her room. I’m not sure if I should go in anymore as she may be busy or something. However, my curiosity gets the best of me and I decide to look inside anyway. Slowly peeking inside, I see Lilly lying on her bed completely naked. I’m shocked but unable to look away as I watch Lilly rubbing herself with her hand. I can't help but stare at Lilly's body. She has perky size B breast and a nicely trimmed landing strip down below that makes me wish I was a plane ready to land.
Lilly slowly rubs up and down with her right hand while soft moans come from her lips. She also is rubbing her nipples going from one to the other with her left hand. It’s then that I can hear what she is saying between moans.
Lily: Oh, Alex, lick it. Lick it. That feels so good. Mmmmmm moans You feel so good, Alex.
It appears she has been doing this awhile as I can see lots of fluids running off her and onto the bed. As I'm watching her, I can't help but to get a rising from my groan. Watching her masturbate is turning me on. I can't help myself and start to rub myself through my pants. She then starts to pick up the pace and rub faster while moaning a little louder. It’s not much longer after that and she starts to shake with an orgasm. She then closes her eyes and just lays there on her bed. I’m not sure what I should do next and I haven't gotten off yet.