The Infidelity Feasibility

Season 10 Finale: A "What If" scenario. While Amy is away for the summer, Sheldon tests his relationship in the most unimaginable way possible: by having an affair. Is this simply a case of "while the cat's away the mouse will play?" or will Sheldon cause irreparable harm to his relationship with Amy? Spoilers for 10.23 and 10.24. OBVIOUSLY AU.