"Oh, a baby? Is it yours, then?" Sugo expressed with that relative disinterested face, raising an eyebrow, his gaze meeting yours. "Mmh, you look younger than Denji... What a surprise."

Sugo didn't remember being informed that Denji had a sister a little younger than him—you—, and that she had a one-year-old baby. But, here he was, with you in the empty hallways of the school, cradling your baby in your arms. Apparently the teachers give you permission to bring him.