Turn on

Okay so my best friend is a guy and sometimes he'll like whisper in my ear bc we good around a lot but his breath on my neck actually kinda turns me on. We aren't like sexual at all were just really good friends but some times I see him getting a little tent (if you know what I mean) when I'm around 
I wouldn't want to do anything with him bc I wouldn't want to risk our friend ship but is it weird that he turns me on?