The Perfect Match

My older brother, a brilliant neuroscientist, died in a tragic lab accident shortly after introducing me to my fiancé, Jack. Jack has been my rock through the grief, but lately, I find myself terrified of him. He’s started using my brother's peculiar vocabulary, takes his coffee black with a pinch of salt just like my brother did, and casually mentions childhood secrets I have never told anyone. Last night, as Jack slept, I noticed a long, jagged surgical scar hidden beneath his hairline—a scar he swears he got from a childhood accident, but one I know for a fact wasn't there a month ago.