I pretty much do the exact same thing these days and what's funny about this is my girl's tits are nicer then her ass, but I just love grabbin some ass when she's on top.
ok so its only a matter of time before i get called out on this. there were no photos which did the boobs of my now ex (her decision not mine, no way i would end having those) justice so here is a sideboob shot which gives and idea of the scale of them (she got re-measdured and was a 30 H) honest to god not pshop work was done
While I love a girl with a nice set of tits, I definitely find myself staring at a nice ass on tumblr for much longer. And a nice pair of athletic legs that lead up to a muscular but round ass...damn. Instantgirlcrush!