A raomce between a prisoner and a gurad, i've never read that trope before but this book gonna make it cute i be- wait time magic?! In exchange for life span?! And this guy using it to read books... no wonder he looks so tired; well at least he looks happy.
And here I thought reading a book in a battlefield is the biggest compliment to the author, using your life span to have free time to enjoy your book is actually the biggest compliment actually.