Circle/Artist: GD-Mechano/Izumi Yakumo
Rating: PG-13 for violence (Izumi-sensei labelled it NC-17, but I don't see how it can be such?)
Characters: Hughes, Roy
Summary: Roy and Hughes during the Ishvaran war. Continues on with Senkou.
I'm sure that most people who read doujin know Izumi Yakumo. If you're one of the uninitiated, go here.
Edit: akai_gekkou has kindly provided an upload of the raw scans in the comments.