The Babysitter (2017) online

Cole (Judah Lewis) is madly in love with his babysitter (Samara Weaving) Bee. She's hot, funny, and popular. One night, in a moment of defiance, Cole secretly stays up his bedtime to discover she's actually a cold-blooded killer who's in league with the Devil. He now must spend his night evading Bee's band of killers who will stop at nothing to prevent Cole from spilling their dark secret. It's up to Cole to survive the night (and blow up a few people along the way)