Rika comes back home after ages, only to discover her shut-in, never-showers, trash-room brother has a massive stinking dick. One sniff and she’s hooked. Starts sneaking in daily to worship that dirty cock, even sniffing his crusty underwear to orgasm. Ends up fucked senseless on the garbage-covered floor, covered in sweat and cum, moaning “onii-chan’s cock is the best” while rolling her eyes. Total filthy cock slave.