My brother's wife, who recently got married, was staying at our house for a few days, and I was secretly enjoying a little pleasure. It was masturbating using my sister-in-law's freshly removed panties as my fantasy... Every day, I'd snatched her panties from the dressing room and indulged in masturbation, but I thought I'd only do it until she left... But for some reason, there were still some flashy panties in the dressing room!? This familiar, erotic smell... Could it be my mother's panties...?