[Rico] Loli Loli My Life (Yoiko to Ikenai Houkago Ch. 7-8) {Mistvern}

Yuki, a shameless little step-sister with twintails, corners her glasses-wearing Onii-chan in the bath to confess she wants to be a couple, leading to a trembling first time that ends with him finishing deep inside her. Afterward he can't keep his hands off her, teasing her soaked pussy and budding chest and marveling at how much more sensitive she's become since they started. The epilogue finds her in the school changing room, proudly telling her scandalized friends that going braless makes it far easier for a boyfriend to strip her.