What Can We Say, We're Classy Girls

Riley, rebellious, sarcastic, and tomboyish, and Aoife, snarky, bubbly, and beautiful. Both so different, yet very much the same. Riley seems to be falling for the sarcastic and obnoxious Winchester brother Dean, who is just as oddly captivated by her as she him. They battle with their emotions, almost as though acting bitter enemies. Aoife seems to be falling for the grim and shelter-minded angel Castiel, who doesn't know whether to admit that he's developed feelings for the girl.
Then there's Sam. The third wheel...