Surprisingly, Qu is actually a huge supporter of Juudai/Yubel or Haou/Yubel or Yubel/Juudai or Yubel/Haou or any combination of the aforementioned.
This was inspired by recent roleplay happenings (Memento Eden, oh god) that totally caused great headbreak in amnesiac!Haou. And the pose was inspired by that one panel in the Pita-Ten manga.
I couldn't think of a good background, sorry. But then again, when do I EVER think of a good background.