I’m rewatching Leverage right now and it just occurred to me - H50/Leverage crossover! Parker, Eliot and Hardison have a con in the works on O'ahu and accidentally draw the attention on Five-0. The only way to pull it off is to make sure the task force is too distracted to track them. So while doing surveillance, they happen to see the way Steve and Danny look at each other and how they’re in their own little world when they’re together, and decide to play matchmaker in order to keep them too busy to stop the con.
The OT3 would totally ship McDanno.