On The Way Out

At the tender age of 24 I think I am too old for my girlfriend. When I was 19, I moved in with an older woman who was 34 at the time. Now at 39 I think she is ready to trade me in for a younger model.
When I moved in she made it clear we were not monogamous and this was an open relationship. We have had many sexual adventures.
Last Saturday I came home and heard the shower running. I stuck my head in the door and told her I was home. She replied with an invite to get in the shower. I stripped and got a surprise when I opened the curtain. She was on her knees sucking a cock. A cock attached to the 17 yr old kid from next door! She reached out, grabbed my cock and pulled my in. There I was face to face with this kid and our cocks inches apart as she worked on both of us. She rubbed our cocks together and got both of them in her mouth at the same time. We broke the action and dried off in order to take the party to the bedroom. When we got there she made the kid get on his knees and suck my cock as she laid on the bed and fingered herself. He did a good job and I nutted in his mouth. After she told me to enjoy the show. I watched as she let the kid fuck her twice.
After it was obvious we would be seeing a lot of this kid. I think she is grooming him as my replacement.