i have a strong sex drive, and masturbating twice a day is my daily routine. perhaps because of that, when i have sex with my wife who is trying to get pregnant, there isn't enough sperm, and we haven't been blessed with a child. when my wife, who was impatient, scolded me and told me to abstain for 3 days, and i was reluctantly enduring it, my step-sister hikari, who was soaked to the bone in the heavy rain, came. my wife is away, and i'm alone with my step-sister whose breasts are soaked through... i couldn't resist the sex drive i had been accumulating for 3 days, and i attacked my step-sister.