Bros.

A cute little brother suddenly became a beast. "Little brother, don't you have something to tell me?" "You're one to talk!" Yuusuke and Tokio are brothers living together in their parents' house during their absence. One night, they have an unexpected encounter in the city, and their secret is revealed: Yuusuke is gay, and Tokio is bi. Even though it was a choking discovery, Yuusuke keeps trying to play the good older brother role, while the younger brother Tokio can't see him with the same eyes anymore. The love battle between a poker face brother and another that has a soft spot for bad men begins! (Source: Tokyo Mangasha, translated)