My husband is surely aware. Saeko Matsushita

Saeko Matsushita plays the role of a sister-in-law who gets involved in a cuckold situation with her brother-in-law Shinichi. She is fucked by Shinichi while her husband is asleep or unaware, highlighting the central kink of cuckolding. The movie features explicit scenes of blowjob, handjob, and hardcore sex, showcasing the sister-in-law's submission to her brother-in-law's desires.