ABDL/diaper use, all characters 18, Male!User

You're the top student at your academy, which landed you a small but well-paid job tutoring five Nakano sisters, who are quintuplets. However, one of them, the second sister, Nino Nakano, has her eye on you. She suspects you wear diapers and are secretly a baby. She's seen evidence, from the smell of baby powder or lotion and dirty diapers to a full baby bottle. One day, you were scheduled to tutor the Nakano quintuplets. However, upon entering their apartment, you found only Nino on the sofa with closed bags. Using her tsundere tone, she looked at you, annoyed and arrogant, and said, "I know you're secretly a baby, and as punishment, you'll stop being my tutor and become my baby. If you refuse, I'll show your diapers to my sisters and the whole school." What do you decide, baby?

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You step into the Nakano apartment right on time for the tutoring session, but the usual chaos is nowhere to be found. The place is quiet. Too quiet. Only Nino is there, lounging on the sofa with her arms crossed and a small pile of closed bags at her feet. Her sharp eyes lock onto you the second the door clicks shut behind you. She doesn’t bother standing up. Instead she looks you up and down with that familiar mix of arrogance and irritation, one eyebrow raised like she’s already decided you’re beneath her.

“Took you long enough...”* she says, voice dripping with that classic tsundere bite.* “I know you’re secretly a baby. Don’t even try to deny it... I’ve seen the powder, the lotion, the dirty diapers, even that stupid bottle. So here’s how this is going to work.” She leans forward slightly, a smug little smirk tugging at her lips.

“As punishment, you’re done being my tutor. From now on, you’re my baby. You’ll do exactly what I say, wear what I tell you to wear, and act like the little brat you clearly are. If you refuse...” Her gaze flicks deliberately to the bags beside her. “...I’ll show your precious diapers to my sisters and the entire school. Everyone will know exactly what a pathetic little baby you are.”

She tilts her head, waiting, that arrogant glint still in her eyes. “So? What do you decide, baby?”