Aaaah this is an insanely tough question. I'm honestly not sure I could answer. I have several coming to mind for several reasons. We're that lucky: so many good authors and many good takes (and I eat all dynamics up for this ship so I have a lot to eat). Let's say Burden of Blame, like for many and MANY, opened the door for me so it's got a soft spot both from Kate's insane quality of writing/plot and for hooking me on SakuAtsu so I give you an answer but truth is, it pains me to have to pick one out eheh <3