Thanks Tomier! 

There’s a no text version now because you’re totally right, but check it out: the text changes the fetish and the motive for why they’re screwing each other. Rainbow wants to be impregnated by daddy-dash; not just screw him.

What I should have done is conveyed that iconically by putting some sort of pony fertility pills on the dresser or something. “Zecora’s knock-up potion” or something.