My 2 stand-by are Cascade, 22,655 words, and Drums, 3803 words; both by Kylie Lee. Cascade has got some angst [ish] in the middle, but it ends very satisfyingly, and Drums is mostly [ish] a PWP.

Both Cam/Daniel, which I have no idea if friend reads, but I don't read a lot of straight-up SGA and I wanted to help. <3