Not even Death can part us

For however little time they have together, they decided to spend it next to each other watching the sunset.
Ace staying right by Marco's side until the very end.
Even when the blond's last breath left his body, Ace didn't leave, accepting his fate....
...
A much different fate than he had expected when soft lips pressed to his forehead instead of teeth ripping through his flesh.
What was going on?!