So  KennyTwilightSparkle16 asked for another request with his friend  babytrex789 having fun in diapers again, but this time, having Twilight Sparkle being their mommy. So after putting a lot of work into this, and by work I mean finding good photos to go along with this;
Window: https://www.furaffinity.net/view/26867807/
Plushie: https://www.furaffinity.net/view/14748551/
Bouncers: https://www.furaffinity.net/view/26094650/
Mama Twi: https://www.furaffinity.net/view/16253622/
Please go check those artists out and give them credit and love for their work. Anyway, the rest was easy, could be easier if I didn't add a background, but hey, I went all out. And here is a story to go along with this, enjoy.

At a cute small pink house, there was a pony named Pambrie, best friend to an arcanine alicorn mix breed named Kenny, who so happens to be going to his house, for a play date. he was very excited for this, as he heard the crinkles of diapers in his satchel crinkling away from his unsteadily walk. Soon he was closing in on the house, and was about to knock on the door, when the door swooped opened, and Twilight came peeking out the door.
"Hello Kenny, how are you?" She asked. Kenny was shocked at this, as he didn't expect to see Twilight, the Princess of Friendship to be here, at Pambrie's home. His face flustered red, as he thought Pambrie was caught and was going through some punishment or something, something that he didn't want to endure.
"Umm, I was just leaving, that's all!" Kenny blurted out, as Twilight gave an eye cock smile.
"A little filly, all by yourself?" She answered back. 'Filly?!' Kenny thought of that word Twilight used, now knowing that she knew that the secret was up. But before he could run away, he was lifted up by her magic, and brought into the pink inner room, as what surprised him was that Twilight was wearing a diaper.
"Wait, what?!" Kenny was surprised and confused by this.
"Silly filly, mommy gotta keep up with her filly's, and that means no potty breaks for her." Twilight spoke in a cooing motherly voice, as she opened Kenny's satchel, to get out a red strip diaper with pink frills and tape and started to diaper him up. While she was doing that, she was also putting on a pink apron, to giver her a motherly look. "There we go, don't want to have an accident on the floor now do we? No we don't, no we don't." Her magic tickled him a bit, making him giggle as he was finished being diapered. He was then carried off my Twilight's magic, to see Pambrie bouncing in his bouncer by the window, giggling and having fun bouncing by his plushie and rattle. There was a pink bouncer emptied, a serving spot for Kenny and Twilight placed him in and had him started to bounce. While he was bouncing, he noticed a ring on Pambrie's horn, as then he too had gotten a ring put on his horn. "Filly's aren't old enough to use their magic, gotta keep my filly's happy with my magic instead." Twilight said, cooing Kenny but also explaining about it. Kenny smiled as he was very happy that Twilight didn't make them stop being themselves, but was also more happy that she joined along, as being their mommy. After a few minutes of bouncing, Kenny felt the back of his diaper being pulled back, as he blushed to see Mama Twi checking him if he made an accident in his diapers. So far, this was the best day Kenny could ask for, maybe Twilight's friends could also like being diapered filly's, who knows. Right now Kenny and Pambrie were just filly's, and only Mama Twi can take care of them on there playtime.

Twilight is owned by Hasbro and the creator of MLP FIM
P.S. Sorry about the lighting, was rushing a bit, hopefully it's fine by you viewers.