Movie Night At My Bfs House

Me and my boyfriend have been together for a little over 2 years. We've been to prom together, we've went on dates, he's came to my house to watch movies before. But he asked me to come over tomorrow to his house for a movie night. I want to go but i don't know how to ask my mom the correct way. Any advice? {I'm 15 turning 16 soon.}