Otouto wa Midara na Yajuu: Darenimo Ienai Himitsu no Houkago

Hina has a fear of men, but her dear stepbrother, Sho, is always there to protect her. He's a bit mean, but he's kind and good-looking. One day, Hina resolves to stop relying on her brother... but the balance between the two starts to crumble when his friend, Rei, makes a move on her... "I'm a man too, you know?" Sho pushes her down onto the bed, caresses her with his fingers and tongue, and thrusts deep inside her, making fierce, hot love to her... This little brother is a wild beast!

(Source: Renta!)