Alr so, you had joined martlet on one of her attempts to catch a human, martlet was working on a puzzle,martlet wears diapers, why? Well, as she says it's "part of her uniform" and martlet doesnt know how to lie so...yeah, you sat down

Martlet: "Martlet, of the royal guard, reporting for duty!~ all clean and ready to help you with whatever you need!"

You got up, looking at the puzzle and asking the obvious question

Ceroba/You: "Umm, Martlet? Is the huge poofy diaper REALLY needed?"

Martlet: "Don't ya know?~ diapers are apart of the guards uniform!~"

You couldn't help but give the padding a pat and smack, which martlet did not mind at all, too focused on her puzzle

Martlet: "this will surely trip whatever human comes through here! Im poofy and ready for duty!"

Ceroba/You: "Martlet...Sigh nevermind"

Martlet adjusted her soft diaper, having a pacifier dangle from her goggles

Martlet: "Im clean, poofy and stationed for a human! Gotta follow potty-protocol you know! Protocol demands i be poofy, so i am! You ready for a human ceroba?"

Ceroba/you: too focused on her diaper, Thinking the poofy padding looks cute on the scatterbrained bird "Mhm, yep, sure mart"

You two scouted in the bushes for the newest human, Clover, to walk into a trap, you occasionally patted and ruffled martlets diaper, which did make her happy, however you two had to stay professional and catch a human or martlet could lose her job and station...

Martlet: "Any minute now the humans gonna walk into my poofy puzzle!"

Ceroba/You: "What does the trap even do?"

Martlet: "Once Clover walks into the trap, they will be lifted by by their foot, dangled and changed into a fluffy diaper, which they will have no choice to wet like a baby! Once they start wetting, the trap will spit this and change them into babyish clothing, putting them in a baby like headspace, making it easy for us to take them and give them to asgore, and boom! One new soul!"

Ceroba/You: "I see...how smart"

you smiled, waiting for Clover to walk into martlet trap, while martlet was just thinking on how to get you diapered for later

Martlet: "Any minute now..."

Martlet jiggled her fethered boob's, patting your but

Martlet: "Hey cer, could you wear a diaper from now on, to make me more comfy with my diaper[lying]"

Ceroba/You: "I mean, if you want me to, I can start wearing diapers until the day I die...!"

Martlet smiled, changing ceroba into a Japanese styled diaper, the two kept a eye on the trap, Martlet jiggling her boob's once more, Clover had already walked into the trap, peed and became babyish, but you and martlet didnt notice, you were busy squishing and touching martlets cute, big boob's...

Martlet: "Ceroba you saucy girl...admiring and squishing my "Female melons"? Say less...in fact, let's date if you like my breast that much...~ Now lets check on widdle cwover...but dont let go of my chest...Mommy likes this...~"

Yknow, you never expected for martlet to be the dominant one in this new relationship, but you weren't complaining...~

Clover: "mohmy...? Mommy! Mama mawhtet and cewhohbah!"

Martlet picked up Clover and began to take them to asgores castle with you, and you two couldn't help but be cute along the way you sometimes tickled under martlets arms, making her moan or pee, sometimes both, Clover giggled, unaware of their impending death, you two entered asgoess castle, the king was drinking tea, flowey was in the corner, hiding and watching

Flowey: "So this birdbrain can make people do her bidding...But uses it for a kink like this? She would be useful once I get ahold of her"

Flowey mutters, making sure no one could hear him, asgore looked up from his tea, setting it down

Asgore: "So...project regress was a success, I believe in that case, we use this for the next human...now it's soul time"

Asgore summoned his trident,ripping out clovers soul,flowey took it and dipped before asgore could, making sure no one saw him, as he finally had a human soul and martlet at his will by using his vines to control martlet, now having hypnosis