My daughter and her husband are building a new house near ours, and we're temporarily living together. My son-in-law, Hayato, works from home, so we spend a lot of time together. One day, he called me over with a serious expression, saying he needed to talk. It turned out that his large penis was causing a sexless marriage with my daughter... I promised to help him, as he's constantly under pressure from his wife to have children...