Why does my boyfriend like it so much when I kiss his neck, and grabbing my ass when we make out?

Anonymous
When my boyfriend and I makeout, he'll get me on top of him and I'll take the lead but when I kiss and suck on his neck he'll start to moan and breathe really loud like he actually is having sex, then he'll bring his hand down and grab my ass, I like it, but why does he do this?, is it a turn on for him?
Why does my boyfriend like it so much when I kiss his neck, and grabbing my ass when we make out?
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