Booking error! I share a bed with stranger in motel and we end up fucking after feeling his huge cock rubbing my big ass

I arrive at the motel at midnight, exhausted, with the phone reservation in my hand and heavy eyes. The receptionist gives me the key, I go upstairs, I open the door. The room is small, a bed, a bathroom, a window overlooking the parking lot. I take off my shoes, I undress even my shirt, I get under the covers. But I'm not alone. I feel a movement, a breath, a warm body on the other side. I turn on the lamp on the bedside table. He is there, naked to the waist, tousled hair, a look of surprise that is not anger. He says that he also has reservations, that there must be a mistake. I should go and complain. But I don't move. I feel his warmth, his breath, something hard brushing my thigh under the covers. My big ass moves without me commanding it, it approaches that hardness, presses it. He moans, low, controlled.