Reiko was watching her daughter and son-in-law as they tried to conceive. She was worried when she heard that her daughter-in-law would abstain from sex for a month to increase the chances of conception, but she couldn't hide her surprise and excitement when she saw her son-in-law's cock, which had become completely swollen after a month of abstinence. (It's gotten so big...I wonder what will happen to me if he puts it inside me?) She tried desperately to release her uncontrollable excitement by masturbating, but she couldn't hold back any longer and started to bite her son-in-law's cock.