Engaged

I'm engaged to marry and am doing so next month, my wife to be went away for a fortnight to visit her grandmother on her father's side. I was at a loss for a while and couldn't wait for her return. Lucky for me her mother (divorced) came over and one thing led to another, and we started fucking and have kept it up since. On my girlfriend's return she thanked her mother for providing me sex while she was away. Her mother has joined the both of us for sex regularly since.