Eh, sounds more like the title to the 80s vampire movie The Lost Boys. One of the first vampire movies I saw as a kid that made me like the classic vampire and not those sparkle fairies from Twilight.
Maybe finds out that they snuck out of the house to check on the labradoodles and her friends when they don't know if it's really safe from the facility so he starts scolding/arguing with her.
One thing I realized is that with Lyds and Beej is that the human reflects their demon. Shoggoth is a Lovecraftian horror that messes with the mind; Lydia is telekinetic. That being said, perhaps Ash's human is pyrokinetic.