Wait, I'm confused by this big point. It was implied that the POV human ended up inside Zecora, based on this:

But for now, she moaned, which could be heard for miles around as she finally achieved orgasm, bouncing and thrusting far harder than usual. The two giant equines just lay there, panting and gasping on the sweat and sex-covered towel. They timidly ground up against each other and kissed, still lying naked on the beach. The thought of covering themselves completely exiled from their sex-hazed minds. Zecora didn’t even notice the faint yelling or kicking sounds coming from her stomach, she was far too enthralled with Macintosh for that.

But somehow instead, you're inside Big Mac's body since we go straight from his lungs, to his bloodstream down to his balls. What happened? Was there a rewrite between those two bits?

This macro Zecora looks like a fun person to rp with. Mind if I get a link to contact them?