Very gently fondle my step-mom's big tits

I watch Millie carefully for a few seconds, but her eyes remain closed, and she has gone back to breathing slowly and rhytmically, so very slowly I allow one of my hands to wander back and touch one of my step-mom's big tits.

I keep absolutely still for a while to make sure she is still sleeping, then I slowly start fondling her breast, wow, this is amazing, I think to myself. Without thinking much, my other hand moves to Millie's other breast and start playing with it. My cock is pushing against my swim suit I can feel, and I am so horny that I can feel I am starting to get carried away here. I have touched a pair of boobs before, but never a pair this size.

I move one hand from my step-mom's big tits and start rubbing my hard cock through my swim suit, and my other hand is slowly but determinedly fondling one of her breasts.

Then, suddenly, the realisation of what I am doing hits me, and I remove my hand from Millie's breast. I just sit there, looking at her for a while, squeezing my rock hard dick through my pants. She still looks like she is sleeping, and I am thinking about what I should do.