It appears to be a 3rd degree felony.

The statute of limitations on this type of offense is 3 years after the commision of the offense. However, the SOL does not begin until the victim turns 18, or if it does get reported to law enforcement or other government agency, the 3 years starts at that time.

The victim could file a civil suit which has a 5 year SOL.

The first course of action would be to report it.