Distant Heart by Chani Lynn Feener

Cor Night is upon us.

It’s the one night a year when even the school encourages the Black Harts to act out on their vices, but Illya Carmine isn’t interested. That is until he sees Rexton Xiphus walk through the doors of Sacred Cor University.
What starts as mild interest quickly blooms into a desperate hunt for ownership as Illya tracks Rexton through the party. But Rex has a game of his own in mind, and giving into the viciously attractive Black Hart easily isn’t on his agenda. Neither of them is willing to back down, but there’s only one rule for Cor Night.

Be vicious with your vices.