Playboy Beast
Riku is a black leopard in high school trying to keep it a secret that he's a virgin who hasn't had his first heat. His new roommate Touma is a white lion who doesn't want anything to do with him as he studies his butt off by day and meets with his sex friend to blow off steam by night. When Riku gets his first heat, the two become physically involved for the first time, and even though Riku tries to get a girlfriend and live his ideal high school life, he can't get Touma off his mind. This doesn't have the best story, but it has beautiful art and good smut. Trigger warnings: dubcon, attempted rape, drug, rape.
His Little Amber
Genji, a former criminal, picked up an injured leopard cub on a rainy day, only for the cub to turn into a human boy who he called Koushirou. Five years later, Koushirou has grown into an adult man, and now he wants to pursue a relationship with Genji, who worries about being together with a child he raised, even if he's grown now. But before Genji can fully work out his feelings, a being who calls himself Koushiro's "brother" appears and tells Koushiro it's time to go home. Very intense and emotional. A good read if you don't mind the parent/child aspect of it. Trigger warning: incest themes (guardian)
Juouheika to Sunakaburi no Hanayome