Acting Fast

"What if – and just hear me out on this, before you say anything. But what if you used Pete instead? Like I said before, I would do it in a heartbeat. But I think this is better. Smarter." Sirius convinces James & Lily to go along with his idea. One that backfires completely. [The events that lead to Peter being the Potter's Secret-Keeper.] Rated T for language. One-shot.