Your best friends brother

Eleanor
I I've recently gotten into a thing with my best friends brother, and things are coming together between us. My bestfriend was the one that hooked us up, but I'm starting to get a weird vibe from her. She says that she loves what's happening and quite frankly so don't I. Have you ever dated you best friends brother, if not would you? And advice on how to make everything work. Also I'm 16 and he's 18. Thanks!!!