Specific modern AU Arthur/Merlin fic - FOUND thank you!

I'm trying to find a fic I read some time ago - I think Arthur is an actor and Merlin is his PA. Will and Merlin are friends with benefits and at one point, Arthur ends up staying at Merlin's Mums house for a long weekend. Will and Arthur engage in a pissing contest battle of wills for Merlin's attention.

For the record it is not Fame and Forune by Melusinahp which is similar in outline and also very good.