I'm so glad you liked this story. And yes, little Mikey doesn't like to be left out. Relationships are hard and no one ever really knows what they want. Don's figured that he wants the best of both and so they do all fit well together.
Mikey really would just jump into the sex for the sake of sex. I don't see him in a relationship with any of them. Unfortunately this is the end and I really wouldn't know how continue this fic except for pure pwp and as good as those are, I'm tapped out for a bit. XD