This is something i struggle with.
However what springs to mind would be to; ramp up the kino, move closer, talk slower and deeper, blink/move/dance slower. It doesn't always matter what your saying, the way you move and what your body language projects can be enough. You know that you already have interest, so build that attraction by creating a phase shift. Suddenly you've gone from a lovable/sociable guy

to the smooth sexy guy

Gambler has a lot of good material on this, check that out as a starting point.
Hope that helped. Peace, Artful