Open Question: Yovng boy humping and grinding on me and touching his penis!!?

[feedcrawler]

So I babysit for these two boys, one is six and one is four, I got there early in the morning before either of them woke up, when the older one woke up he peers from behind the wall and smiles when he sees me and runs to the couch and asks to put on shrek so I do. And he starts standing on top of me, which i didn't mind it was fun hahah, then he sits down and starts straddling me facing me (im a girl btw age 14) and then turns around and starts humping my leg, like grinding. So i lift him off, as he is old enough to know that that is not appropriate, and I allowed him to sit on my lap, the whole time he kept pinching his balls and was rubbing his feet all over me. He at one point begged me to smell his feet "come on pleaseee my mom always does" as he lifts his legs up he puts his feet near my face... Foot fetish much? Gross! I didn't know what to do, like I want the kids to think I'm nice and don't want to assume everything he does is sexual towards me, but idk....he tried humping again and I told him no more. Is this a crush? Should I be concerned of sexual abuse or is this just a crush? Is he masturbating by grinding on my leg and tugging on his ball sac. The younger one, age four also tugs on his balls, it's strange..

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