After all was said and done, Lanina had to sleep in the same room with Vivian. There were simply no rooms left to accomodate the demoness, only Vivian's room had space. Hao Ren actually had no issues sleeping together with the succubus, but that would have probably gotten him murdered...
Vivian reluctantly accepted the arrangement after Lanina assured her that she was not a lesbian. It took a while before the vampire decided to trust her. Besides, if Lanina was a true blue lesbian succubus, she would have already struck by then... Going by how a succubus operated, sleeping in the same room or not did not actually matter.
