Camouflage — Kyell Gold

Danilo has found the trick to being not-straight at a Catholic University: just fade into the background. Until the day he can't anymore, and bullies chase him to the river, where he falls in. When he emerges, the year is 1508 and he soon finds himself on the run from armed soldiers with two unlikely friends. As a white tiger in the sixteenth century, Danilo would be welcomed into the oppressive Church, but as a queer person, he could be imprisoned or burned at the stake.

Not a hard choice, until one of his friends lands in prison with a death sentence, and Danilo has to embark on a rescue more dangerous than anything he's faced in his life, past or present.