Just don't tell her daughter! There are various opportunities and situations that Life places us in that we cannot explain, nor do we want to. There's no real way to explain it without it sounding completely ludicrous, but here goes... I was swimming one day and when I looked up my sexy Mother-in-Law was standing there. We usually flirt innocently with each other, but what happened next will change our lives forever. She stripped, got on her knees and started sucking my cock. We fucked each other's brains out that day in the hot California sun. Ahh... life is good!
