Twilight Fucked Herself when she was a filly

The small filly stood in front of her older brother, staring up at him with pleading eyes and then she asked him "BBBFF, I'm in heat and I need your help."

Shining armor was shocked at his sister "WHAT?!"

"Twily, you can't just ask your own brother to rut you!"

"But-"

"No buts! I'm not going to do this and Neither is Cadence."

"Why-"

" it's disgusting, Twilight! Incest!"

"But-"

" what did I say about buts?"

"Don't you-"

"Just go to your room" he walked away

She did as he said and made her way down the hallway, up a large flight of stairs, and finally into her bedroom.