Help with sitting on boyfriend?

Heyy, this my first post as I’ve got a few questions that I’d like answering, that are personal and a little embarrassing however I want to react accordingly, I’m recently in a relationship of a few months with this amazing guy, we’re both waiting a little bit longer before initiating anything and we’ve talked about our boundaries and whilst we aren’t opposed to doing anything we want to wait a little longer. I’ve kissed him and made out with him, like any normal relationship and occasionally when we hang out I tend to sit on his lap, we both know it won’t go anywhere and he initaties it in asking as well as I do to, I sit on him as he lays down however as it’s natural he keeps getting hard when I do this, it’s fully normal and I don’t mind at all but I find it strange as I’m unsure on whether to stay sat down with my full weight as surely that would be uncomfortable. If rather not mention it yet. How should I move, as to not hurt him, and is there a chance it’s something else, part of the time it feels like a small lump that isn’t usually there other times it feels as if I’m sat on an edge of a phone but that’s not possible. I don’t want to keep sitting there however I assume that if he was in pain he’d move me. Sometimes I think he might like it however my whole body weight must be uncomfortable, what should I do to better this situation and not make any thing to tease him.

Help with sitting on boyfriend?
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