My new stepsister is a diaper girl—?! I woke up and there she was, right beside me?! Sharing a bed with my little sister, changing her wet diapers, her sweet clingy sibling secretly peeing on my lap—then, deep into the night, reverse nocturnal diapering! Wouldn't it be nice to have an adorable little sister in diapers? This is the fantasy brought to life. A bold little sister, obsessed with her big brother, closing in (or is it?), captured through a first-person POV camera—an entirely new kind of diaper drama, portraying a heartwarming (or is it?) daily life. ~STORY~ A year ago, my father remarried. It was a second marriage for both parents. And Thisuka became my stepsister. But Thisuka had a secret insecurity. Due to a physical condition, she couldn't hold her bladder—diapers were a necessity. I found out shortly after we started living together. Back then, she was still distant, calling me "big brother" with formal politeness. "I might end up troubling you... forever," she confessed through tears. It must have taken incredible courage—but seeing her so earnest, I didn't feel pity or sympathy. I accepted her completely. "You're not a burden at all. We're family, after all." The radiant smile she gave me then—I remember it clearly, even now. From that day on, I felt we truly became siblings. Or at least, that's what I thought—because the problem wasn't with me, but with Thisuka. Sure, she opened up—but the feelings she directed at me were less sisterly, and more... well, way off the sibling scale. In short, my stepsister's sense of boundaries is completely broken! Asking me to change her diapers? Inviting herself into my bed because she "sleeps better"? Constantly clinging to me, excessive physical affection—this is way beyond normal! And to make matters worse, Thisuka is just too damn cute. No brother could stay indifferent when a sweet, innocent girl playfully nuzzles up and smiles at him like that. At the very least, give me credit for still holding onto my sanity. I struggle daily to maintain self-control, desperately trying to be a good older brother for her sake. But as it turns out, I'm the only one thinking that way... A first-person POV, slice-of-life diaper drama with a loli stepsister—heartwarming? Think again.