But there are so many! Nearly everyone gets at least one great bit somewhere along the line. Still, if I have to pick... hmmmm.
I guess I'll go with Maya's kiss the morning after she shows the MC her family photos. That whole scene is really sweet and has one of the more interesting uses of the Status system. It gets even more poignant in retrospect when we learn why that was Maya at her happiest. But part where Maya kisses the MC in a mix of jealousy, affection and playfulness stands out to me. So I'll pick that as my favorite.
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That said, honorable mention must go to kissing Jill in the shower. It only misses the top spot by a whisker.