I need some opinions…

Hi, I’m F17 approaching 18 and I’m incredibly close with my brother, he’s my best friend. A few months ago I met the majority of his friends at his 21st birthday party. I instantly clicked with one of his uni friends - M19 nearly 20.We were talking for hours about books, climbing and we were laughing and having a really good time, he even offered to lend me books at any time, i

All I have to do is ask. Most of the night we were in quite close proximity and kept smiling at each other. I don’t know whether there’s any hope of us ever being anything of if he was just being polite. I would never want to screw up my brother’s friendship but i really like him and we have lots of the same values and instantly had a connection…am I being delusional or is there something there?