MIAA-208 - Secretly seducing me right under my wife's nose: My niece's sticky, close-contact thrusting

My brother and his wife went on a trip, leaving their niece Mizuki in my care. She’s always been attached to me, but now that she’s all grown up, her body is dangerously tempting. While sitting in the living room, she climbs onto my lap, pressing her body against mine, and I can't help but get hard. Instead of being disgusted when she notices, she just gives me a seductive smile and presses even closer. With my wife nearby, I sneakily insert myself into her, starting a slow, sticky, and intense session of thrusting right under everyone's noses.