Looks like there has been a change of plan. While Leya and Lily were supposed to head out, instead it seems like Leya will just use Lily on the stairs. One can never be sure what Leya is thinking at any given time but clearly something snapped and she needs to grope and kiss Lily right now. Given that Lily is her property means that this is a simple task, just drag her to the stairway and take her right there.