SPRD-1400 - Hooked on my son-in-law's massive package: A mother-in-law's secret desire

Living with her daughter's family, Sumire accidentally catches a glimpse of her son-in-law's bulging crotch one morning. She can't stop thinking about it, and soon finds herself unable to resist, eventually giving in to her urges while he's napping. That night, as she relives the sensation, he walks in on her, leading to an inevitable and steamy confrontation.