Ethan reaches out to a person in Erica's past, and discovers something about himself in the process. SPOILERS for "Everything She Wants" and onward. M/M. No flames. If you don't like, don't read.
If Erica was willing to see what was in front of her she'd have known it was about it. Post season finale introspective look at the doctor and who he was the regrets he might have himself.