What is "moving too fast" in a high school relationship?

For some background, I'm eighteen and he's seventeen. Neither of us have had a real relationship before, so we're both inexperienced. The first time we kissed/made out was two weeks ago. He's a gentleman, so he hasn't tried anything more than kissing or cuddling, but I know he wants to. How do I let him know that I want to go a bit further (second base, etc.) and is it moving too fast after two weeks?
What is "moving too fast" in a high school relationship?
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