Boku, Mou Dechau! ~Moteasobareta Sausage~

"AAAAAA! Am I sick, big sister!?"
One day Kenta-kun spurted white pee from his penis and ran to his beloved onee-san in a panic.
Oh dear oh dear, he's still such a young thing.
Dirty sexy older sister decided to show him that white pee is a good thing...
Out came her vibrator. She helped him milk out another splashy load!
... Then he was primed for their perverted uncle...

[From DLsite English]