Hidden in his stepsister's bed, a curious brother can't resist the temptation to stroke his throbbing cock while she's in the shower. His heart races as he imagines her wet, soapy body just feet away. He pumps harder, his breath hitching, until he hears the water turn off. Panicked, he tries to tuck himself away, but it's too late. She walks in, catching him red-handed, his cock still hard and glistening with pre-cum.