Aoi Mizuki, a married woman, visits her husband's parents' house. She mistakenly opens the bathroom door thinking it's the toilet, and finds her naked brother-in-law taking a bath. Aoi is fixated on the huge cock between his legs, and in her fantasies she gives him a handjob, an assjob, and a deep throat, making him cum in her mouth and swallowing his semen! She can't get the image of his huge cock out of her head, and while she masturbates with a thick spray can, her brother-in-law witnesses the scene. In a fit of lust, Aoi attacks her brother-in-law, gets his huge cock hard with a slutty blowjob, and inserts it. An incestuous sex session that makes her moan with pleasure!