You made the claim that someone who is molesting young children would not generate seretonin by doing so which is a claim awaiting evidence.
I've already provided evidence. Look up the definition of serotonin. Look at the list of behaviors that contribute to its production. None of these are compatible with molestation. You are making a naked appeal to ignorance (a counter-claim based on lack of and or no data). You are moving the goalposts (raising the bar/burden of proof). Please provide even one counterfactual. My claim is perfectly uncontroversial.
Dopamine production is compatible with molestation and compulsive behaviors (such as molestation) are strongly correlated with addiction.
If someone derived sexual climax by playing with and or interacting with an infant in what would be considered a normal manner (in full view of protective family members of the infant), and the cortisol levels of the infant were never raised, then the interaction would be at worst morally neutral and would certainly not qualify as "molestation".
Here's another example. Imagine that a person with an acute foot-fetish works at a shoe store. Even the slightest contact between the person's fingers and the customer's foot produces a pronounced rush of dopamine and often results in sexual climax. Imagine this person is able to suppress the more obvious (visible/audible) signs of this (internal brain chemistry) and remains apparently professional and polite to these customers.
While most people would probably be repulsed by the thought of this, it would be at worst morally neutral to the participants.
The customers in this scenario are not "molested".