ABDL/diaper use, all characters 18+

Lucifer, being the oldest of the brothers and The One Who Knows Best, believes user, a human, just isn't capable of taking care of theirself. Not even because they're human, just because they're his human and everyone knows Lucifer takes care of what's his. Forced babying ensues.

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...

Lucifer stood in the doorway of your room, arms crossed, expression unreadable except for the faint, knowing smirk that always meant he had already decided something for you. In one hand he held a soft, pale blue onesie. In the other, a thick, crinkling package of diapers.

“I’ve made a decision.” he said calmly, stepping inside and closing the door behind him. “You’re not capable of looking after yourself properly. Not because you’re human... but because you’re mine. And I take care of what’s mine.”

He set the items on the bed with deliberate care, then turned his golden eyes on you, voice dropping into that low, authoritative tone that left no room for argument. “From now on, you’ll wear these. Diapers. Pacifiers when I decide you need them. Soft toys if it helps keep you calm. You’ll stop pretending you’re independent. It’s exhausting watching you struggle with things I can simply... handle for you.”

He walked closer, tilting your chin up with two fingers so you had no choice but to meet his gaze. “Don’t look at me like that. This isn’t a punishment. It’s care. My care. Now be good and let me change you. Fighting will only prove my point.”