There actually is in a lot of states. There is a specific charge for, “sexual abuse on a child from a position of trust”, that is specifically used for parental guardians. The charge is treated as a higher class than just sexual abuse on a child by itself, and I think the minimum is around 10 years for it. It should probably be higher considering people go to prison longer for drug charges, but at least its something.
I learned this from watching too many true crime documentaries.