My first rare pairing is JC/Rufus Wainwright - two great things that taste great together, as they used to say in the chocolate/peanut butter commercial debate. The stories are:
New Brand-Name Black Sunglasses,
I Love Ya and Whatever, and
Opera by
queenofhell (also known as Proserpina).
My second rare pairing is JC/Jon Bon Jovi (and the sequel has a 3-way of JC/Lance/Jon Bon Jovi)
Hotel Bar Hangover and
Tangled In the Mess by
ghettogreta.