HELP my python as something strange moving inside him??

[Elise.m]

For several of my bps, if you touch their stomach, their muscles will retract or flex up a bit in response to my touch. I have never thought it looked like something was moving inside, but then again, I have never thought of it that way. If that is the case, no problem, just a healthy snake.
A trip to the vet could not hurt, but it might cost you a lot for nothing.

I've witnessed this with my BP's. There was one time I had my Lemon Pastel (Female) out with my Het Pied (Male) and he was bumping her away with his muscle anytime she would get on top of him. It might look like there's something inside of the BP to someone with an untrained eye, but I don't think it's anything to worry about.

I'm not positive, but I don't think internal parasites can get big enough to actually move the hosts body.