My sister-in-law surprises me on the toilet and we have an unexpected romp

My sultry sister-in-law, a petite nymph, surprises me on the toilet. Ignoring my wife\'s rest, she flaunts her tiny tits and ample ass. I\'m drawn to her innocence and desire. We engage in a wild encounter, with her taking my big dick and receiving a slapping that leaves her craving more.