Engulf Catgirl's upper torso with my ass. Giving how much the subway trains jostle (and any struggling she may do but who cares about that, she is FOOD), I shouldn't need to put in any more work than that- she'll be wedged fully up there by the time I need to leave for my stop. I'll get up and leave potentially no traces of the cat at all- perhaps the slightest bits of pink hair...