The webcomic involved aliens (who looked kind of like Lombaxes but with clawed feet and no tails) training to be soldiers on a space station which also served as a boarding school. There were other aliens (including ones that looked like giant eyeless Velociraptors), but no humans.
The "Lombaxes" were a warlike race fighting on multiple fronts, and the main character had a rare disorder that left him scrawny and pale compared to the others. He had two sisters, with both being romantically involved (one was in love with an eyeless Velociraptor), but as it turns out he's asexual. He thought it was because of the disorder, but both of his sisters have it and are just fine. He compares it to looking at beautiful buildings. He can tell when someone is attractive, but he is just not attracted to them.
I remember one scene where he kissed one of his girl classmates because he knew he wouldn't be able to finish a race in time without her chasing him due to his disorder. I would have read it around 2012-2013, but it had been ongoing for several years at that point.