You DON'T. I've said this before and it might bear repeating. The vast, vast, vast majority of brothers aren't into this. The same way the vast majority of couples aren't into this. The internet along with sites like this and porn have got your mind all twisted into thinking that every black man you see is interested in fucking your girl. They're not. The same way every couple isn't interested in me fucking the wife/girlfriend. You're much better off joining a site(a paid one) and reaching out that way.
IMHO