During summer vacation, several adult niece characters leave the city to visit their uncle's remote country home. They play freely in the open rural setting, and glimpses of their sweaty bare nipples make him fully hard. After noticing the bulge in his pants, they reach for his cock with seductive smiles and tease, “Uncle, we'll play with your nipples.” Their devilish nipple play makes him cum repeatedly, leading to a summer filled with sex.