I'll have to say... I have 2 favorites. The first is, of course, me on top. Preferably with a thick dick. I want the dick fill my pussy completely. Even better when it's long and thick and has a slight curve, so it's hitting my Gee. At the same time, my legs are spread/straddling wide, so my clit is exposed, grinding against the base of the dick... and WOOOOOOW. Super-wet double effing cum!!! .
Second, would have to be me on his lap while face to face, knees bent, fucking in-sync, cumming at the same time...