“Wow this is just the best,” Scootaloo says to herself.

She notices this pair of overalls are rather a bit snug over her new diaper and she can hear it crinkle softly as she walks. She goes over to her model cart and begins stacking logs in it, in preparation for yet another playtime adventure.

Rarity smiles as she watches Scootaloo. She has her wet shorts held in her magic field as she takes them and other items of clothing to the laundry room for washing.

Scootaloo is again lost in her own world while playing when she feels another urge from her body. This time her bottom feels a growing pressure and she knows what’s to come next. Scootaloo stops playing and looks down at herself and then over to the house.

“Well, Rarity told me I can use my diaper as my toilet… so here goes.” Scootaloo says quietly to herself.

She gets onto her knees and begins to push, and is quickly rewarded with lots of soft poop filling her diaper. The more she pushes, the more poop comes out. It feels wonderfully warm and squishy against her butt. She quickly finds herself liking the feeling and pushes even more, as she wants to fill her diaper as much as possible.

‘Oh wow! This feels great! I’m going poop in my diapers and I like it, I love to go poop in diapers!’ Scootaloo thinks while smiling to herself.

As she empties her bowels, her bladder opens up and she just relaxes where she is and wets herself. Her pee comes out strong and steadily. Scootaloo just stands there while pissing and messing herself in her new diapers. She really likes this feeling and rubs herself to feel the fullness of her diaper.

Her diapers feel so good between her back legs!

Now, with the diaper very full and pushing against her overalls. She sits down on her cart, feeling her poop squish around her bottom and up the front of her diaper. She rubs her butt back and forth on the wood planks and leans forward with her back legs spread, further spreading her poop around so that it’s smeared all over her pussy and base of her young penis. Scootaloo sighs with pleasure after a few minutes of this activity before going back to playing.

She’s very satisfied with herself and with how much fun and use she’s getting out of her first diaper.

Rarity keeps an eye on Scootaloo during this period and realizes after a bit of careful watching that she’s just pooped herself and seems to be quite enjoying it.

‘Well my little filly has certainly adapted to her new diapers quickly. She’s not at all bothered by messing herself and I guess she actually does want to be back in them. I can and will go along with this if she continues to feel the need. It’s a good thing I bought a fair amount of diapers for her. She’ll be wearing them all the time now,’ she thinks to herself.

Two hours have passed since Scootaloo pooped herself. She’s also peed in her diaper again, making it feel even more full. She likes the full diaper feel as it encases her crotch and butt. Several times while playing she presses a hoof to her crotch, feeling the full diaper. She thinks to herself that maybe she should go and get her dirty diaper changed, but she likes how it feels and the mess that covers her butt and between her legs. Now peeing again, she sighs as the urine flows through her penis and gushes into her diaper.

“I love doing this,” she says to herself.

As she finishes wetting, she looks across the yard back toward the house. There she sees Rarity looking at her from the back door. She opens it to call Scootaloo back inside.

“Scoots, please come here so we can talk and see if you need a diaper change.”

Scootaloo is surprised at Rarity’s openness about changing her and saying those words so loudly, slightly afraid any passing ponies might overhear. She starts walking back to the house feeling how her wet and messy diaper feels slick and squishy against her crotch. Rarity smiles to herself as Scootaloo approaches, and her full diaper becomes even more obvious with the way she walks.

As she gets to the door that Rarity holds open, Scootaloo walks on into the house.

Once in the kitchen, Rarity asks; “Well then, how is your day going so far? Are you having fun?” She smiles as she smells Scootaloo’s poopy diaper.

“Yah, everything is just great. I’m having fun today too.”

“I’m glad, that’s good to hear. I can tell that you’ve made a mess in your diaper. It smells. How are you feeling about that?” asks Rarity.

Scootaloo looks up at her and smiles.

“I’m fine with it Rarity, I just felt the need to go and you said that I can use my diaper as my toilet… so I did!”

“And wearing your messy diaper for all this time was okay?” Rarity replies.

“Yes Rarity, I didn’t mind it at all, it… kind of felt good to me too,” Scootaloo says as she blushes.

“You’re such a funny filly Scoots, come on, let’s see if that diaper is messy enough to require a change.” She says.

Rarity takes the lead to the bathroom with Scootaloo following just behind. Once there, Rarity has her remove her overalls so that the diaper and plastic panties are again the only thing Scootaloo has on, before having her lie down on her bed.

“I’ll need to get you a changing pad for your changes one of these days, so you
won’t get the bed or other furniture dirty, but for now, we’ll just use a towel. Now lay down here so Rarity can see her diapered filly.”

Scootaloo gets on the bed as asked and looks up at Rarity as she prepares to open her diaper. Rarity places her hoof on the front of Scootaloo’s thick diaper and slides it down to her crotch in an effort to feel its fullness.

“Goodness me; this little filly has truly filled her diaper this morning. It’s wet and messy and very full,” says Rarity as she continues to rub her crotch through the thick diaper and smooth plastic panties.

She removes the panties, pulling them down Scootaloo’s legs and then pulls the diaper’s tabs gently before pulling back the diaper between her spread legs exposing her very messy crotch, now covered with poop made even more slimy by her pee. The smell of her mess hits them both.

“Well, Scootaloo you’ve filled this one very well so far,” says Rarity as she smiles down at the filly.

Scootaloo returns the smile with her own, saying; “Yeah Rarity, I did, I filled my diaper good!” She then can’t help but giggle with amusement at her own statement.

“Yes you did, Scootaloo, and it’s okay with me, too. You’re a diaper filly, one that must wear diapers because you like your pee and poop filling your pants,” replies Rarity.

She notices that Scootaloo is a bit aroused as Scootaloo’s poop smeared penis is erect. “And it looks to me that you really are enjoying all of this, my little diaper filly.” Rarity says.

Scootaloo blushes again and just nods her head yes.

Rarity decides it’s time to give Scootaloo a bit of sex education during this opportunity, since she sees Scootaloo is erect. She explains to her that when her penis is hard as it is now, that means she must be aroused and excited. She says that getting hard is a very normal thing for colts and also for fillies who have a penis as well, and that she is not at all mad at her. She explains to Scootaloo that her wearing and using diapers excites her and that she is okay with this and so should Scootaloo.

“Also having your wet and messy diapers being touched by somepony else like I was just doing when you wear them will also help you become aroused.” Rarity ads.

“I just want you to know this Scootaloo; it is okay for you to be excited with diapers. Fillies get excited over different things, and diapers are one of thoes things. Don’t feel guilty or weird because of this Scootaloo, you are a wonderful pony, and even better as one that likes diapers,” says Rarity with a reassuring sound in her voice.

“Thanks for telling me Rarity, I do like diapers, and I love using them,” replies Scootaloo.

Rarity leans down and kisses Scootaloo again but this time on her mouth instead of her forehead.

Seeing that Scootaloo likes wearing her used diapers so much, and that the diaper has not yet leaked very much, Rarity decides that Scootaloo should be able to enjoy wearing them for a while longer before needing a change.

Scootaloo grins up at Rarity as Rarity pulls the thick disposable diaper, its inside smeared with poop and heavy and pee, back up between her legs and over her crotch covering her thin light pink pussy and smooth penis, and once again taping it tightly in place.

Rarity can’t help but spend a minute rubbing Scootaloo’s erection through the bulky diaper as the smell of poop continues to fill the room.

“Now, stand up so I can get your plastic pants to cover all of your diaper. We don’t want any leaks escaping into your pants, do we?” asks Rarity.

“No Rarity, no leaks from my diaper,” says Scootaloo as she complies with her request.

Rarity gets the plastic pants to cover all Scootaloo’s diaper again and then lifts her off the bed and onto the floor, a task that is not nearly as easy as the last time she looked inside Scootaloo’s diaper. She then hugs her and gently rubs her messy diapered butt.

“Now get your overalls back on and get back to playing. Stay close to the house so I can find you when it’s time for me to check on the state of your diapers again.”

“Okay Rarity,” replies Scootaloo as she puts on her denim overalls back over her heavily used diaper. She looks down at her diaper and then up to Rarity.

“Thanks for looking inside my diaper Rarity, I like when you check it!”

“I like checking your diapers too Scootaloo, even though you are nine years old and
using them again. It’s okay with me because you are okay with wearing and using them,” she says.

“Yep, I sure am!” Says Scootaloo as she scampers from her room, her un-changed diaper and its contents squishing pleasurably between her legs as she runs.

Rarity smiles as she watches the diapered filly leave the room.

“Yes.” She says to herself, “That filly will be in diapers for a while. I wonder if Sweetie Belle would like to wear diapers with Scootaloo when she returns from that summer camp.