I like my bro's friend?? 2 years older?? help!?

okaayy so im gunna be a freshman and my brother will be a junior. he has thiss hooottttt friend who ive had a crush on foreveer.. he always teases me but latley things have gotten flirty and i actually really like him. he'll say things on how im soo hot and i always trys to talk to me and is like age doesnt matter in high school! and yeah my brother just laughs, and ik he doesnt care. so yeah do you think i should persue him and flirt back?? or no? thankkss:))))