Since the Rebecca images are now ripped from a demo, here's Hechikanism's Binding Blade images in their own gallery.

I cannot find a source for them at all so no idea if these were one-offs, an april fool's joke or if Hechikanism planned to do an FE6 H-game (like they have done for the Marth games as well as Rebecca's own dedicated H-game) that is lost to time. (since while the Rebecca H-game isn't uploaded anywhere, it is still available.)