Ruri Saijo's elegant figure had always captivated her stepson Takashi, unable to look away. Her beauty and the alluring curve of her cleavage constantly stirred emotions within him. Yet, guilt toward his father weighed heavily on his conscience. Secretly watching his stepmother masturbate became his only solace. But one day, that no longer satisfied him. His desires grew stronger, gradually consuming his mind with a new, uncontrollable impulse.