Not a close friend, but an acquaintance a couple times. Both times neither of us showed each other our faces before we met. First time though, through chatting we figured out we knew each other, and decided to meet up and jack off. It was hot, but kind of awkward at the same time haha.
The second time it happened, I figured out I knew the other guy, but I'm not sure if he recognized me or not when we actually met. Neither of us said anything about knowing or recognizing each other.