Summary:

When Shane takes a hard hit on the ice, he wakes up three days later to find his reality has been shattered. But the truth is, it wasn’t reality at all. Just an elaborate set of false memories conjured by a brain injury. 'False memory syndrome' they call it. Shane calls it a nightmare he couldn't have imagined.

Or

Shane doesn’t have amnesia. Instead, he wakes up wanting his boyfriend only to realize his brain concocted a bunch of fake memories of a nine year situationship and Shane has no idea how to live in his actual reality that Ilya hasn’t been a part of. Luckily, Ilya is…curious.