To go from super skinny to XWG you're talking about a long yarn. Realistically it takes years to get there. My ongoing tale called Belle of the Drive In is one such story. It begins when the couple meets, both are very thin, about 115 each. It's more about a mostly realistic life of a young...
I think authors should definitely expand their horizons into new genres or story types if that's their desire. Trying new things is a good way to become better at what we do. I think it's exciting to see author branch out. Besides if you have some writing in you, you have to get it out or...