Sex with my last gf was great...we were both switches, her def more dominant on the take, also a full bodied classic figure and a face that got compliments everwhere...like a vintage look--anyhow, one thing i loved was when she put her hand over my face when on top, with a bit of that lusty sneer 
 
 
i picked up on this, did that and also pinched or basically grabbed her mouth (ie thumb on the cheek and pointer finger on the inside of the mouth, like you're picking up a piece of meat 

of course, she and people i've done it on are who i find to be sensuous sexual women, the ones i like, so obviously know that before trying.