Sister Hasumi Claire and younger sister Kana Tsuruta swap husbands and have swapping sex

When a frustrated married woman (Claire Hasumi) consults her younger sister (Kana Tsuruta) about her worries about her nightlife, she suggests swapping sex, and each swaps husbands (Shinya Matsuyama and Soushiro Imaoka) and gives them intense blowjobs and cunnilingus. They even end up having raw sex and creampie!