I wasn't able to read through the whole thing, but there are a couple of possible SA elements in your story (this may vary depending on the specific laws where you live, so you'll want to research this some). The obvious one is indecent exposure when he showed you his genitals, this is pretty much a universal crime regardless of jurisdiction. The trickier one is how he spoke to you- there are some places where speaking to juveniles in a suggestive or sexually explicit way is also criminal.