The son-in-law, who works as a chiropractor, has a daily routine of giving a massage to his mother-in-law, Yukari, who suffers from stiff shoulders because of too much breasts. However, the son-in-law's real aim is to take care of his plump body! - One day when Yukari noticed that she had no bra, her son-in-law's lust exploded! - She grabs her long-awaited mother-in-law's milk and sucks it harder than her daughter-in-law. And taking advantage of Yukari's good-natured personality, the son-in-law further escalated the domestic affair ... #班長P