25M4F - Masturbated Next to My Sleeping Ex in Bed

My ex girlfriend and I have a strange relationship. Well, maybe not strange, but certainly special. We broke up midway through college after I found out she was cheating on me and wasn't willing to stop seeing the other guy. She ended up dating him for a while.

We were high school sweathearts, had known eachother since we were kids, but after we broke up we didn't speak for several years. Eventually, we got back in touch and reconnected. We really are best friends now...

But here's the thing. I never got over her, and still pine for her. She's moved on in terms of romantic interests, and has dated several other people since. Like I said though, our relationship now is special. We're very very close. When she visits, she sleeps in bed with me and we cuddle. There are very occasional pecks on the lips--but we're just friends, as much as I would like it to be more.

She visited me the other week, and as we were lying in bed in the morning cuddling, I couldn't help but get hard, thinking about here lying next to me. She sleeps fully clothed with me now, but still--just feeling her warmth next to me.

She was asleep, and I took her hand, interlacing our fingers, and rested my head on her shoulder. I waited a few minutes for her to drift off again, and then quietly started masturbating. I held her hand tightly as I came in my boxers, and immediately went to the bathroom and changed into a pair I had left there.

I'm wondering what would have happened if she had woken up and caught me...

I'm open to this going in any number of directions, it's open ended on purpose. One thing that could be fun is if it develops into her telling me about what she was doing when she cheated while she strokes me, or tells me about things she does with her current fling. But really, I'm open to this going in any direction including just vanilla sex, but if so, it must be realistic.