His Own Humanity is an AU series set in modern-day America (plus magic) featuring characters from Rurouni Kenshin (primarily Saitou and Sano) and Gundam Wing (primarily Heero, Duo, Trowa, and Quatre). In chronological order (generally), the stories currently available are:
The New Familiar — During Plastic (part 80), Cairo thinks about thinking and other recent changes in his life
Get Used To That — A look at how Trowa and Quatre are doing
Cross-Cancellation — Couple analysis among Heero, Duo, Trowa, and Quatre
Guest Room Soap Opera — During La Confrérie de la Lune Révéré (parts 33-35), Sano’s 178-day wait is over as what Hajime has been fearing comes to pass
Consummate Timing — During Guest Room Soap Opera (part 3), Cathy learns a lot of interesting facts and Trowa is not happy
That Remarkable Optimism — A few days before the epilogue of La Confrérie de la Lune Révéré, Duo and Sano get together to watch football and discuss relationships and magical experiences; Heero listens in on multiple levels.