The Angel Demon Twins.

One day Sebastian opens the door to find two girls there asking for a job. He lets them in and they begin their lives at the Phantomhive manor. Later on Sebastian learns the truth about them and this results in talking to the one person he thought he would never see again:Ash Landers. Things are also in for Ciel and Alois, what do you expect? With two cute girls in the story something's bound to happen,right?