I guess a LOT of magic will be needed, if 'something' is to come from their relation... 2 female ponies (same species, unicorn-pegasus-earth all mixed) can work, with some simple magical-alteration to genetical structure (easier if both are of the same type) ...but 2 females of the 2 different species ? Mmh... only an Expert in the field of medical magical-alteration could pull out this feat ! *Insert name of famous Doctor-ponified*
Ahh... the magic and wonders of theories and hypothetical explanations through the range of probabilities and possibilities... Always fascinating.
now here's something weird. A shipping pic of my two least favorite characters in the while show, the only two characters I don't like to see in pairing stories and art, being paired together, and me actually going "awwwwww" inside.
I guess this is a good example of how two negatives make a positive.
(Confound these ponies, they drive me to allude to algebra!)