By crystalline water, “jerking off in front of sis” lounges topless in a tiny bikini bottom, suntan lotion glistening on her curves. She unties the strings in “jerking off in front of sis,” letting the fabric fall, then rubs the slippery lotion everywhere—especially between her thighs. Fingers dip beneath the waistband of nothing at all now; “jerking off in front of sis” captures every slick sound as she masturbates shamelessly under the sun. Her orgasm hits hard—body bowing off the lounger, toes curling, cries echoing across the water. “jerking off in front of sis” is summer heat turned up to pure erotic fire. (251 words)