[Hijiri Tsukasa] Shojo Ane, Kangaeru [KeizerD]

Hina, a bespectacled virgin whose hoodie hides a heavy, soft chest, watches couples fill the streets and spirals into wondering whether every single one of them is having sex tonight. Her idle curiosity turns into hands-on discovery through breathless kissing, a slick paizuri session, and her own defloration — until her partner's cry of 'Hina nee-chan!' lays their sibling bond bare. A sheltered older sister finally gets answers to everything she's been quietly thinking about.