[mrrobot1994]

A couple months ago I googled " cuckold roleplay ideas" and the results led me to some xossipy threads
One of the stories in a thread was along these lines, pardon for missing some details, it's been some time:
A husband and wife has to attend a reunion, wife is excited but the husband is not, because there were gonna be his bullies attending the reunion as well.
When they are there, he can't find his wife, he goes to look for her and finds a room where a woman is giving a blowjob to his bully, soon realises that's his wife.
Bully catches him and shouts at him, wife doesn't know that's her husband as her face is turned the other way. 
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The bully asks the husband to keep a lookout to see if others are coming so they don't get caught while the bully enjoys his wife.
Now the husband has to keep a lookout so another man can enjoy his wife.

The story you're looking for is really interesting. I also want to know its name to read it.