AU, Time-wimey, blah-blah-blah.
Sirius had been noticing that something was off about his friend a few months before Lily was supposed to have her and James's baby. He'd been distracted more, and kept skiving off on them to go do something – Sirius didn't know what, which made him all the more anxious – and he would always step around any questions that he asked.
Like the other night, Sirius had asked if he wanted to go walk around somewhere, and when he asked where to go and Sirius answered "Diagon Alley," he immediately said that it wasn't a good idea. When asked why, he'd given a poor excuse of Death Eaters lurking around. Peter, instead, was up for it, making Remus shrug at them and turn back to his book, but then Sirius was left to walk around Diagon Alley with Peter, and that hadn't been fun at all.
Sirius was very upset to say that he was beginning to believe that Remus – well, the traitor. And that thought didn't sit well with him.
These'll be really short story things, but I'm typing them all up together and I'll try to update them when I'm having trouble with other stories. (Or perhaps all at once. Dunno yet.)