Damn, for those on the fence about how twisted this could get...
Yes, it's totally natural for a young boy to do those exact things, but that would be a secret to take to your grave, methinks. Definitely not in the midst of a confession of true love. Maybe save it for the foreplay later.
Front half of the chapter was pretty good, though. Honest discussions like that are healing. Not sure that I like the implication of sensei getting "unrepressed"