After their parents left for a trip, Nanami found herself enjoying some special time alone with her beloved older brother. Though he wasn't good at studying or sports, his innocent charm attracted her in ways she couldn't explain. With her fully matured I-cup breasts, she lovingly comforted him, her warm, sweet presence always capturing his heart. As they spent the day together, she whispered to him, "Onii-chan, does Nanami's big tits feel good? Today, fill both my breasts and my pussy with your white stuff—give me lots and lots until you're completely drained!"