Naughty idea: have AJ have your foal instead.
You decided to do something for the Mare here, an very naughty idea come to your mind but also helpful in some way. Applejack just though that she is going to get an incest foal and with good reasons, her womb was flooded to the brim with her brother's wiggling gametes and that's undeniable. It'll be weird if she won't get pregnant, Mares on heat when rutted and filled had 99,99% chance of getting pregnant.

So... instead of getting Big Mac's foal, she is gonna get your foal.

You formed an protective layer around the fertile and colorful ova, pushing away the sperm and unable to get in the much bigger bubble that surrounds you and the egg, the tadpoles tried to get in but it was a futile attempt with your magic. With an smile on your face you approached to the round reproductive cell, placing an hand of it, feeling the gelatinous surface of it. It was slimy and warm to the touch but it seemed to react you as it core glows once more and with much intensity, making your magic flare.

Uh? Well this is interesting.

Anyway.

Humans and Ponies are crossbreedable, there isn't chance for an hybrid as it either born pony or human but it's usually mostly pony in case of a mare being the mother. So the funny fact it's gonna be far more genetically diverse than an inbred foal despite different species which is also the chance for the offspring to be much more healthy as result. So Big Mac, unfortunately won't have chance to have his genes mix and grow into an inbred foal with his sister but instead, they're going to get an healthy, genetically diverse foal from you.

So to do so.. you opted to...
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June 2, 2023