OK, I'm doing some infidelities but not quite. It's a Arthur/Percival Modern AU with Arthur/Merlin Canon Era... Yeah right...
Layer Cake, by
cyus ; PG ; One-Shot ; 3600 words
A/S : Life's about cake and choices even when destiny peek-a-boos at a school fair.
It's a reincarnation fic wherein Arthur and Percival are a couple, and Arthur "recognizes" Merlin at the school fair of their (Percival and Arthur's) daughter. It's both fluffy (the Arthur/Percival kind of thing) and painful because the situation between Merlin and Arthur is awkward, and full of memories that don't really belong to them. This is a very beautiful fic, and Percival is wonderful in his love and his trust of Arthur, no matter what.