"So... how does it feel? The leg, I mean. Is it weird?"
Steve's sensitivity has apparently already given way to rabid curiosity, but a strange sensation shooting through your leg prevents you from responding with anything but "uhhhh". Looking down, you spot the latex shifting far faster than before, rippling along your rear and then flowing down your previously untouched leg. It takes it only a few seconds before both both your legs are changed in the same way, your entire body from the waist down covered in shiny black and white rubber and looking otherwise mostly unchanged, but the feeling is still there. The white coloration shifts once again, moving to the front and down your legs until it colors you to the ankles again. What happened with the oil must have made it change plans again or something... not that it matters. All that matters is that it's still going.
You feel a pain above your rear, a strange sort of pinching, and when you grab at it you're surprised to find something solid between your fingers. It's sort of curved and ends at a small point, and looks sort of like... a dorsal fin? You think it's odd at first, but then the latex between your legs pulls together, shredding the split at your underpants and bringing them together into a single, long mass. Your feet are twisted to the side, flattened and broadened further into a flipper, and your "legs" (if you can still call them - it - that) are rounded and thickened, taking on the shape of a dolphin's tail more strongly. With all of that done, and you left lying in the middle of the street looking like some kind of merman, the latex stops. It's not wriggling or wavering about, it's not moving forwards, it's not even progressing at a painfully slow rate anymore. It's just become completely inert, apparently having fulfilled its purpose.
Steve just stares at you, slack-jawed. "That was messed up, man."