A glorious fuck-ton of sensual/sexy kissing references (per request).
Just as a tip; notice how the lips either fit one on top of the other (making a zig zag from the side view) or they press against each other to compress the typical lip shape. (Sorry, I tried! This was a bitch to compile; there are no good kissing references out there. I’m still looking. If I find any more, I’ll post ‘em. Fuck; I’m done for the day.)
[NOTICE: The bottom three images are GIFs. Wait for them to load.]