As Simple as That by busaikko - When the past Severus cannot recall starts to haunt him, Eileen turns to the man who was there when she wasn't.
Weight of Memory (link provided if to the epilogue, which links back to all 8 chapters) by innerslytherin - One is a murderer, the other is a spy. But when dire circumstances force them to turn to each other, can Remus and Severus overcome their history enough to work together?
Remus Lupin and the Monument of Magical Balance by thesnapelyone - “Wouldn’t give up his post,” Tonks said, shaking her head. “It was rather pathetic, actually, Snape did some sort of sticking charm to himself so he couldn’t be removed from his desk.”
One Night in Bucharest by snegurochka_lee, Remus/Charlie, Remus/Charlie/Snape (with references to past Snape/Charlie and Snape/Lupin) - Romania: August, 1993. An English farmhand meets an attractive stranger in a pub. Little do they know they are both haunted by the same man from their past.