I'm a hopeless guitar player, but bending a note has always meant to me pulling the string, as it's plucked, sideways, causing it to wail up, then back to originial note...ooooOOOOoooo....as the string is slowly pulled back to original position.

Phillip, as a writer I would suggest you find a blues guitarist to show you what you want to write about. It will give you a better feel...and not make real guitarists cringe if you get it slightly wrong. (My husband was, in his youth, a championship target shooter...and always dismissed police procedural novels/detective stories that didn't get the guns right.)