Rina Takakura, a married woman, proposes to her husband a fictitious investment proposal that her beloved brother-in-law has requested. She even accepts her husband's raw creampie for her brother-in-law's sake, but while her husband is away, she enjoys some intense, forbidden sex with him at home. Rina goes crazy, crying out in joy at her brother-in-law's sticky, intense oral sex. She seeks his hard, pointed cock, which is thrust deep into her honeypot, resulting in a cumshot in her mouth. Her brother-in-law's desires, which he has released, play with Rina's body, which is torn between pleasure and guilt.