What's the limit?

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So my boyfriend and I are both 15 (he's only a little bit older by a couple months) and we've been dating for about five months. We've kissed and made out before which was pretty hot, but he keeps on talking about pushing our relationship a little further. He doesn't pressure me to do anything and respects my limits, and I know that I'm obviously too young to be having full out sex, but we can still kind of mess around, right? In your opinion what would be okay to do at this age and what's definitely not okay? Thanks x