I have a strong sex drive, and masturbating twice a day is a daily habit.
Perhaps because of this, I don't produce enough sperm when having sex with my wife, who is trying to conceive, and we haven't been blessed with a child for a while.
My wife has grown impatient and scolds me, telling me to abstain from sex for three days, so I tearfully endure it,
when my sister-in-law, Hikari, arrives in the pouring rain, soaking wet.
My wife is out, and I'm left alone with my sister-in-law, her breasts soaking wet...
Unable to suppress the sexual desire that had been building up for three days, I pounced on my sister-in-law.