Shining armour had been waiting for this moment for a long time. After months his wife was off on a trip and he was left alone with his daughter.
Twilight had been easy to convince to teach him the spell. Anything for her BBBFF after all. If only she knew what he had in mind for it... his cock twitched at the thought of his depravity
He pointed his horn at his little princess and then everything exploded into stars.
His vision slowly returned and he gave his new body a quick inspection. Bright pink hooves, tiny little wings, and most importantly, a snug diaper.
He squeed internally. Finally, he was a little filly without a care in the world. His pleasure was short lived however, as his stomach gave a painful grumble. Lucky that he cast the spell now, and not later. Flurry wouldn't have been able to hold this much longer.
For the last day he had been feeding his daughter nothing but beans and broccoli, and now he would be able to appreciate the gift brewing in her tiny bowels.
With a groan he relaxed her ass and let the warm bounty fill his diaper. The vile stench was even more intense that he had dared dream, and sitting there stewing in it, he began to feel his loins stir.
Unfortunately his tiny hooves were unable to pry off his diaper, and all he could do was futilely rub his daughters tiny cunt through the diaper.
Suddenly the door flung open and cadence walked in.
"Honey I'm home" she cried.
She marched straight Over and started blowing her husbands body. On the floor his eyes bulged.
His wife was sucking his daughters cock!
After swallowing the load, cadence approached her daughters body on the floor.
"Smells like someone needs a new diaper"
Lifting him into the bed, his wife took off his nappy. And then she proceeded to eat it's foul contents.
"Mmmm, you always make the tasties treats for mummy" she moaned. "But you still need to be cleaned up so you don't get a rash"
Flipping him over, cadence proceeded to tongue punch his fartbox.
"Now Shiny, it's only fair you clean my rancid ass and cunt"
Turning around, she lifted her tail for him. Eagerly shining armour greedily lapped at her stinky butt driving his tongue deep.
"Looks like someone's hungry" she giggled. "Let me give you a hand"
A magic glow surrounded her hole as she stretched it wider and wider for him to clean. He crawled deeper and deeper into her ass until his entire body was fully inside his wife's gaping mud cave.
Suddenly everything went dark as his wife relaxed her magic and let her asshole close.
"I can't believe you cast a spell like this on our daughter. I want you to stay in there and think about what you've done"
Shining smiled. Being enveloped in her warm , stinky embrace wasn't much of a punishment in his mind.
Fin.