Description on DeviantArt:

and yes in my universe princess twilight was married to flash sentry but they never had any kids together however flash had been staying out later every day and night so twilight followed him one day and caught him with lightning dust and their daughter flash dust finding out the reason flash was never around anymore and yes twilight is pregnant it’s not flash’s kid or timber’s it’s because the human twilight was pregnant at the same time with sunset’s children and so the baby in princess twilight’s belly will take form of her and whoever she becomes intamite with next which ends up being rainbow dash after they become married.