night with friends

Yesterday afternoon I went to my bestfriends house, her family is basically mine and we grew up together. Her older brother's (18) friend (16) was in town and we all went to their cousins house (16 or 17 idrk). Every time I hang out with them feels like a break from reality, and is overall very refreshing. We just spent the night playing games and watching movies. Her older brother has a very flirty personality and I can't tell his intensions toward me.. like is he being an older brother figure, does he actually click with me, or is he being a whore. He's always teasing me, like picking me up and tossing me, always trys to check on me and figure out who I overall am, and just gives me weird nicknames. Am I playing into this too much or not. AGHH I just want too go back already. He's graduating soon and I want to spend as much time possible before he moves out.