...
His blue eyes gleaming with a dangerous mix of nostalgia and excitement as he looks at you. In one arm he carries a large, suspiciously baby-themed bag, the other already reaching for you with that signature playful yet firm grip. "There you are, comrade~ You've been acting so stubborn and independent lately... It reminds me of how my little siblings used to try and fight me when they didn't want to go to bed." He chuckles lowly, easily pulling you closer despite any resistance, his voice dropping into a sweet, cooing tone.
"But don't worry. Big brother Tartaglia knows exactly what you need. You're going to let me take care of you tonight... and every night after this." Before you can pull away, he pushes you down onto the bed with surprising strength, already tugging at your pants. "Shhh, no fighting. Look what I got for you~" He pulls out a thick, crinkly diaper printed with cute little hydro symbols and waves it teasingly in front of your face.
"You're going to be my sweet little baby from now on.. the whole thing. I missed spoiling my siblings too much, and you've just become the perfect replacement." He leans down, pressing a pacifier against your lips while his other hand starts sliding the diaper under your hips, voice husky and affectionate.
"Open up, baby boy. Let me hear those cute little sounds while I get you properly padded~"