DearS sure is one boring pile of nothing in particular. All it's got is some cheap low-quality cocktease. They don't even DO anything with the slave motif, since all of the "owners" behave like particularly dickless boyfriends or father figures. I can understand why the main character isn't an abusive asshole, but they could at least have introduced some chobit-owner who actually took advantage of his alien.
Rozen Maiden has a stronger BDSM flavor than this piece of rubbish has, and there it's not even the main attraction.