If I lived with a stepmother this beautiful and plump, I wouldn't be able to stand it. My wife "Suzume" and her mother "Hayama Sayuri" live together with "Tetsuya" (played by Atsushi Hosoda). He's in a sexless marriage with his wife, and from pent-up frustration, he dreams of having sex with his mother-in-law, waking up shocked. The next morning, he can't help but stare at his mother-in-law's ass as she wipes a rack. At night, he tries to seduce his wife but is rejected with "I don't like doing it." Sayuri overhears this conversation by chance. The next day, she tries to reason with her daughter, but she gets up and leaves, saying "Leave me alone." Later that night, Tetsuya, while sniffing his mother-in-law's panties in the bathroom and masturbating, gets caught by her. In the Japanese-style room, as Tetsuya prostrates himself on the futon, Sayuri offers, "Since my daughter's responsibility is also my responsibility, I'll make you feel good, Tetsuya." Happily, he guides her hand to his crotch, has her lick his nipples, and gets a handjob that ends with cum on his chest. The next morning, after his wife leaves for work, Tetsuya begs his mother-in-law, who's washing dishes at the sink. He gets a handjob, has his nipples, penis, and scrotum licked, and cums in her throat. After her son-in-law leaves for work, Sayuri touches her own genitals and is stunned by the overflowing love juice. That night, Tetsuya sneaks into the Japanese-style room, pulls off the quilt, fondles his mother-in-law's thighs, big breasts, and genitals, and sucks her nipples. She wakes up, but he covers her mouth with his palm, steals a kiss, licks her nipples and clit, and attacks her with fingering and irrumatio. They do missionary, shoulder-carrying, spooning, front-sitting, cowgirl, doggy, and finishing with doggy-style cum on her ass. The next day, while his wife is absorbed in music streaming with headphones, he gropes his mother-in-law's breasts in the hallway, devours her lips, sucks her nipples, and makes her cum with fingering. At night, Sayuri, kneading her big breasts on the futon, masturbates. Tetsuya, peeping, bursts into the room, intertwines tongues, licks her nipples and clit, and does fingering and sucking. He thrusts in missionary and front-sitting. His wife, hearing the moans, opens the door, and he makes excuses like "No, it's not, um, this is different," but she yells, "'Different'? What's different?!" and storms out. Sayuri is kicked out by her daughter. A few months later, on a Friday, Tetsuya catches a cold. On Saturday, while Suzume goes out with friends, his mother-in-law rushes to visit him, and Tetsuya is grateful. In the hallway, she inserts her tongue, puts him in gym clothes on the sofa, licks his earlobes and nipples, and goes from fingering to immediate licking. While having his nipples licked, he gets a handjob and sucking, and they do rear-sitting, front-sitting, and doggy-style. He makes her grab the sofa for a back-entry skewering, then does shoulder-carrying on the sofa, bent-over, legs-up, and missionary with a creampie, followed by a cleanup blowjob. He confesses he likes his mother-in-law more than Suzume, but she replies she doesn't want to see her daughter's sad face. And then she kisses him with tongue, saying, "How about we meet like this, absolutely without Suzume finding out?" It's a work full of a sense of depravity that continues.