His niece falls asleep defenselessly in the warmth of the kotatsu. When he peeks inside, he can't help but notice his niece's fully grown body. He sneaks under the kotatsu and starts to play around with her thighs, ass, and pussy, but she wakes up. Far from being reluctant, she gets excited more than expected and gives him an aggressive kiss, sticks her head out of the kotatsu and gives him a blowjob. Finally, she gets so excited that she has sex right in the kotatsu!