"I thought you were having trouble being alone..." While his wife was back at home preparing for the birth of her child, his sister-in-law Riona came to check on him. Koji, who was feeling lonely, welcomed her in with joy. However, Riona's care doesn't stop at housework and cooking, it also extends to Koji's lower body. No matter how patient he is, he can't resist her gorgeous and lovely beauty... He is completely defeated by her tempting sex!