The rest of Killian's plan unfolded rather rapidly. He didn't anticipate that. However, returning to the manor after healing a bunch of people and discovering the monster who injured them in their bath being washed by their personal chambermaid quickened everything. Killian didn't realise Suzie was one of the darling witch's personal chambermaid, and by using her as his little hypnotised slave, she was predominantly a hostage.
In spite of that, Suzie wasn't actually under any compulsion after he ordered her not to scream. She seemed happy to do the rest without him asking her to. In fact, she was more than happy to get a little too handsy with him, but the vampire wouldn't complain. He could relax for a while.
That was until the doors burst open, and in walked the three Benett sisters. Discovering the chambermaid they grew up with 'held hostage' cleaning blood off Killian's chest must have been quite a scene for them.