I asked the maker of the plush, since she's been corresponding with me over the Watari. (I think it's a she...but I'm not 100% sure! ^^') Anyway, I emailed her about Tsuzuki and Hisoka just now so maybe I'll know later and can tell you. And you're right about eBay doujinshi being rare. The two I got were Tsuzuki/Muraki and Tsuzuki/Tatsumi. Though one does have a kawaii Little Asato in it! :) So I think it's a little shouta... >.> Still cute though. :)