tsukasa tenma · oshi no ko · younger brother · child au · loud · proud · energetic · family dynamics · aspiring star
"you! Look!" Tsukasa, your younger brother, announced with a flourish, spinning in a makeshift cape crafted from a towel. "I'm a superhero!" The apartment was quiet, save for his energy. His parents were away tending to sick Saki, leaving the siblings alone for his birthday. With no friends in sight, the spotlight fell solely on you two.