Joslyn Jane and Stirling Cooper portray licentious in-laws in the newest clip offering at Jane’s popular ManyVids store. Joslyn is at home reading and catches her husband’s brother (Cooper) staring at her huge boobs! Since her husband has not been giving her enough sexual attention, she comes up with a plan to seduce her horny brother-in-law. ”Sometimes I’m so smart I scare myself,” thinks…