"I've seen this cock before" Jenny thought as she sucked the cocklegänger of her ex.
Daniel was pissing in the urinal when he noticed the man next to him had a cock that looked just like his?! "Wow" thought daniel, "my very own cockelgänger!"
A cock doppelgänger. Similar to a stunt dick. A cock that looks eerily similar to yours, especially for use in a MFM, where the F would be able to live the fantasy of having two of her SO simultaneously.