An issue from the post What If question stories (#87 started a run of stories that got rid of the alternate history and just told "darker" versions of stories). This issue by Bill Roseman and Leo Manco told a story of Rogue and Nightcrawler growing up together with Mystique and Destiny. Manco's art has it's great quality but also has moments when Rogue goes from 14 to 28 in two panels. The story itself is, of course, tragic but it's a good read overall.