At Love's End, Only Desolation Remains

In the third year after her heart failure diagnosis, Mom finally got a matching donor heart. She and I both had the rare panda-type blood, and worried something might go wrong, so for three years I made sure to store blood every single month. But right before the heart transplant, Darrell diverted my three years of stored panda-type blood in an emergency, all for his best friend Maya. I broke down and demanded answers, but he shoved me away, his face blank.