In the heat of April, a curious sister explores her taboo desires with her unsuspecting brother. She starts innocently, masturbating in secret, her fingers dancing on her clit while she fantasizes about him. Their paths cross in the bathroom, leading to an explosive argument. But later, she can't resist the temptation to seduce him, revealing her naked body and inviting him to join her. Their lust builds, but a sudden intrusion forces them to pause their forbidden dance.