His Own Humanity

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 reading order, which is mostly chronological, the stories currently available are:

Seeing Red

Sano enlists the help of exorcist Hajime in discovering the nature of the unusual angry shade that’s haunting him.

Plastic

Best friends Heero and Quatre have their work cut out for them assisting longtime curse victims Duo and Trowa.

The New Familiar

During Plastic (part 80), Cairo thinks about thinking and other recent changes in his life.

Fast Decisions

A look at how Hajime and Sano are doing

Get Used To That

A look at how Trowa and Quatre are doing

Reciprocity

A look at how Heero and Duo are doing

Nine Decades

One story from each decade Duo lived through as a doll

Cockatiel and Armadillo

A meeting and conversation between Kamatari and Wufei

Cross-Cancellation

Couple analysis among Heero, Duo, Trowa, and Quatre

La Confrérie de la Lune Révéré

Quatre undergoes an unpleasant magical change; Heero, Duo, and Trowa are forced to face unpleasant truths; and Hajime and Sano may get involved.

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.

After-Dinner Brandy

A few days before the epilogue of La Confrérie de la Lune Révéré, Trowa tells his entire long history to Catharine and Bernard.