A defenseless, busty sister gets fucked by her super-strong younger brother. She thought she was seducing her virgin brother, but... it turns out to be a surprise!

My sister Sana works as a librarian in Tokyo and has come back to her hometown. Sana is worried about her younger brother Cage, who is dedicated to exercising and has no interest in women. He showed off his cleavage and seduced him by saying, "I wanted to let him touch him," but his younger brother's sexual desire, which had been piled up, exploded! She uses her hair to capture her sister and massages her huge breasts! She forces her to give him a blowjob and ends up having sex with her virginity and even cums inside her... However, once a joke awakens my younger brother's instincts, he chases him all the time and asks him to have raw sex and fuck him everywhere in the house...