Raise Up, Heart by Leta Blake

Hearts don’t lie.

Two years ago, grief took Cole’s heart when he lost Damon, the love of his life in an accident. He’s felt empty ever since.
But his lover’s heart survives, placed inside his cousin, Alex. As time passes, it becomes clear: Damon’s heart is too devoted to Cole. It’s strong, and lovelorn, and terrifyingly true blue. The fight for Alex’s body is brutal. But, to win, Damon’s heart only has to beat.
Even faced with the horror of his lover’s eerie return, Cole’s heart leaps at the chance to finally have the man he’s yearned for. What will he sacrifice to be with Damon? And who will pay the ultimate price?