Looking for a McShep fic, where Carter (possibly with SG1) visits Atlantis and John is sick, she is surprised to see Rodney caring for him. They are living together - I think it is written/set before S4 when Carter takes charge.
ETA Despite having half the details wrong, the fic is found, link in comments!
ETA Despite having half the details wrong, the fic is found, link in comments!