Squire of Sol II - Knights of Sol, #1

In a matter of months, 20-year-old Drew will become a nuclear time bomb. He'll then live out the rest of his days as the most famous living sacrifice in this sector, responsible for representing all the moral repercussions of any future act of war against the Emni, an "alien" race on a neighboring planet's moon. It's a pretty privileged life, if you don't count the fact that he's being raised like a sheep for slaughter.
He doesn't even really have to think about it - that is, until an Emni named Riis is sent as part of an exchange program to his school, Americas University of Enseeos. Riis is everything Drew is not. He's polite, he's thoughtful, he's honest in a way that's almost painful, and he's a six-foot-tall four-horned alien. Riis would basically be an unknown if it weren't for the fact that he was chosen for this program.
As a child born in a war camp during the height of a failed uprising, his life has been anything but privileged. What starts as a jarring lesson in cultural awareness slowly blossoms into a rich, lush affection. Falling in love across an ancient battlefield is no joke, but they manage to find quite a bit of humor along the way.