My sister-in-law's lewd butt makes me want to devour it

Marika, who has been married for five years, has recently begun to dislike her husband, Ken, who has only shown interest in his butt. Tsurugi's younger brother Susumu overhears her saying bad things about her husband to his cheating partner! ``I'll keep your mouth shut, so please listen to my request!'' he said, stroking Marika's butt, and even started rubbing his swollen cock against her ass...