If you liked the Inu x Boku SS anime, the Anime-Planet community thinks you'd like:
All Morioka Kohei wants to be a regular photographer, but all he ever seems to capture on film is ghosts! With 70 percent of his photos inhabited by the undead, Kohei has managed to gain not only a reputation, but also a job at an occult magazine. Things couldn't be more "normal" until he is sent to a obscure castle where he photographs a mysterious girl with a knack at disappearing, thus piquing his interest to return. And thus, Kohei sets out on a journey that takes him into the heart of the occult, on a mission to help the cutest vampire in existence find her long lost mother!
Both animes have loli/small Tsundere type female characters/ Lead male characters wanting to protect. Both animes have a supernatural, rommance undertone theme going on. If you liked one you'll most likely enjoy the other.