Good god Xie, I can't imagine how hard this was for you to write. I don't even mind the late S2 angst all that much and this was seriously painful to read.
That being said, it was really good. To copy alicesprings, my favorite line was this:
But I drove home instead, and all the way up in the elevator I played with Justin’s hair and touched his face.
And this part just killed me:
I bent low over him while the last of my orgasm shuddered out, and held my mouth at his ear while he moaned and jerked underneath me.
I didn’t say his name. I just kissed his face, and then pulled out of him gently.