While my wife was back at her parents' place for the birth, her sister stayed over at our house to handle my sexual needs so I wouldn't cheat with other women. My wife went back to her parents' house for the birth. I was living alone for the first time in ages and was totally going wild. Whether she knew about it or not, my wife's sister came over. “Brother-in-law... aren't you trying to cheat?” She went straight for the heart of the matter, and I couldn't hide my shock... “So you don't cheat, I'll take care of you instead...” she said...