So he likes kissing u for enjoyment or is he fond of you? Just don't get treated like a kissing toy will do.

Of course. Those ppl are the ones who have a pure mind,kind heart and in a peaceful state. (Eg. Babies) They are the ones who can easily see them compared to ppl with hatred and in a revenge state of mind.

Simply just ask her school's Biology teacher .

If you want to seem less desperate, don't text her back just wait.

You can text her back again but if she still does not give a reply, she's ignoring you. High possibility of not being interested in you. If this happens, just go find another girl that knows your value and cherish you.