Married and Horny

My marriage is great, and my wife is great also. But with 4 young children it wears her out. So, she isn't as active sexually as I would like her to be, but I also didn't want to ruin my marriage by having an affair. Luckily for me my wife (37) realized I (39) needed extra sex, so she arranged for a lover for me. She asked her longtime friend (46) to fill in for her. Her friend divorced and having a tough time. Got a free place to live (with us) and would get a better job as my personal assistant. I was somewhat shocked but accepted as my wife was trying to help me and I was horny. Her friend was somewhat horny herself but would have never got involved with me without my wife asking her too. Now 2 years later and the children less trouble due to most going to school now, my wife is more willing to have sex with me and her friend as well. Threesomes are more regular now and PA provides sex when we are away. Perfect arrangement.