In the dimly lit office after hours, a blonde-haired beauty, my stepsister, sneaks in to find me hard at work, or so she thinks. With a mischievous grin, she locks the door and approaches me, her big tits and round ass swaying seductively. She leans in, whispering, "I've been playing a game, and you're the prize." Before I can react, she's on her knees, her soft hand wrapping around my throbbing cock, giving me a slow, teasing handjob.