Incest Story Search.

i,ve read this story a year and half ago. . . . but ican't find it now . . . it's a mom son story where mom watches her son masturbate. . . .then asks him to bottle his cum as lotion to apply on her ass and tits . . . . . there's this scene where son jacks off on her ass and rubs his cum all over her ass ,then mom asks him to give her a spank... just one spank. . . . that was amazing and now i can't even find the story . . . . . mom's name was kyra or kira btw..