Title: Guilt
Fandom: Harry Potter
Character: Sirius Black
Prompt 129: Sirius and Lily have an affair.
Sirius Black sat tensely on the couch in the living room. He didn't know what to say or how to act around James. Almost a year ago, Sirius had a drunken romp with Lily. When they woke up the next day, he felt terribly for what he had done with his best friend's wife. They swore never to tell James about that night.
He hoped to take that secret to the grave, but he didn't know if he could stay quiet for much longer. The guilt slowly ate at him as he watched James playing with Harry on the floor.