I love it when a woman dresses in something very business-like and professional, and I can catch a quick glimpse of some very sexy lingerie. Kind of lets me know she's more than just "Ms. Business". You know, that whole librarian thing.
Moving on to when things are actually happening, It's great when the girl kisses back, meaning that she will move to kiss me and not just wait for me to kiss her. (and kissing is the best anyway) Having her stroke her hands across my shoulders, and move them back and forth between my lats and glutes like she's checking me out is pretty hot, especially if she pulls me closer to her while she's doing it. I love to find a little wet spot on the crotch of her panties during foreplay. It makes me feel like whatever I'm doing is working for her, and the wetter she is, the better it's working. I'm also a big, big fan of a woman that has long, soft hair. No gel, no hairspray, no nothing. I like how it moves with her, and how girls throw it over their shoulder when they're talking to me. The best is how a girl can use her hair to brush and stroke across my belly and thighs as she's going down on me.