If your worried about acting on it when you know you shouldn't I would strongly consider chemical castration. It has relatively low side effects and wears off after 3 months. Also you can ask a psychiatrist for it and don't really have to give a perfect reason just say you need it to cool down off the strong feelings or what not. No need to mention little girls.

If the main problem is knowing that you can't act on it and that's what the main issue is rather than whether or not you can control it. I would strongly consider talking to someone about it. I told a close cousin of mine and it was a relief to be able to talk about it to someone. Just make sure it's someone that you trust not to call CPS on you cause that can mess you up even if they just investigate and find nothing.

Also you can ask a therapist what the reporting laws are in your state. Some states are not under mandatory reporting and you can tell a therapist (that has experience, talk to them and get to know them first) and they can help you. Even if you are under mandatory reporting from asking a person that works in CPS (I just asked her as an acquaintance) she said that CPS almost assuredly wouldn't investigate if the person was seeing a therapist, only if the therapist thought the person had reasonable suspicion that they had or would act on it would do anything.

Hope something here helps. Good luck.