Assuming my 4 closest friends were not straight and one of them confessed he liked me in that way?
I'd probably blink and go "what? ....Come again?". And then say "Oh boy...Look, you're one of my closest friends, and I practically consider you family...But no, I'm sorry. I don't swing that way. I hate to hurt you like that, but I'm not into same sex relationships."
And then probably crack a joke that since I consider them practically family, it's one step away from incest, so double whammy.
I'd probably blink and go "what? ....Come again?". And then say "Oh boy...Look, you're one of my closest friends, and I practically consider you family...But no, I'm sorry. I don't swing that way. I hate to hurt you like that, but I'm not into same sex relationships."
And then probably crack a joke that since I consider them practically family, it's one step away from incest, so double whammy.