I need some advise please?

So my friend likes this guy who had been homeshcooled before coming to high school and has never had a girlfriend. he is really athletic and has muscles i didn't know existed i mean he looks like a god anyway his dad was in the navy and so was his grandpa and he is kinda a flirt but not a lot of girls like him i only know of me and my friend who like him well i sit next to him in my tech cl and we always joke around and have races like who can type faster and when we get to listen to our music he leaves the headphone that's an my side out so we can talk even though one of his best friends sits next to him on the other side and almost all of the men in my family have gone into the navy like my dad grandpa and brother and i just think that me and him have so much in comen but my best friend liked him first and i don't want to like backstab her or anything but i want to ask him out and our leadership cl id going to disneyland in like 4 days and he is going too and i was going to like ride the roller coaster that goes really fast with him and act all scared and hold on tho him but like i said i don't want to hurt my friend so what should i do?Also there was this Sadie's dance awhile ago and like for two weeks before it he kept saying like i need a date for Sadie's or no one has asked me and are you going to Sadie's or did you ask anyone and like hinting that he wanted me to ask him but i knew his neighbor was planing on asking him because it was convenient