Thank you japanese people for suitably BREAKING MY BRAIN!
The pairing that makes no absolute sense.. in the LEAST. Ah, but it made my Ukitake muse giggle, but only because he has no possessive bone in his body -and- he is trying to figure out -how- that could happen. In the process though my brain, it's pasteded on.
Edit: Dear Shunsui and Ukitake. Remind me never to give you two a camera and costumes EVER again. (though it is kinda hot *nudges shuufish)