The logistics of that match is terrifying on it's own

Mmm...nope. I understand the mechanics of mating. I get that the mermaid had relations with the minotaur. The resulting offspring's appearance is what's being discussed.

That's not a horse D, that would be centaur, it's a bull's.

There is my mistake! I forgot my myths...minotaur has the human body and bull head.
Stoopit strongsad.

I like to imagine that they look like a regular person but they have a random band of scales on their waist and tiny, tiny horns