The crucible fires and destroys the Reapers. Shepard nearly dies from his wounds, but is saved by Tali. Jump forward a month later, to an interactive segment where Shepard walks around his house on Rannoch. You can see a picture of his wedding day with Tali. You look out at the neighborhood outside, and see a great deal of children of various races, krogan children being the most prominent. Geth have made smaller platforms to represent the geth youth, who are given some intelligence upon creation, gaining more as they "age". Shepard can call his team mates and check in on how they're doing. There is a TV that details the latest news, such as the Rachni obtaining an embassy on the Citadel, Omega becoming part of Council Space, and so forth. Tali walks in with her helmet off, and her hand on her stomach. They plan on naming the baby boy "David'Shepard nar Rannoch."
That's how MY game would end.