The artist made this pic not even a week ago. Its either a preview of a doujin he's going to make in the future, or simply a just a single page he made. He already made many of those teaser 1-page doujin-looking pics.
Don't you feel the same way? Stay quiet Lenalee.You'll wake Johnny.You want to do it here? Sorry...
Right now I just want to forget everything... Allen-kun, wait...