Thick as Thieves Series by Tali Spencer

After Vorgell the barbarian fucks himself with a unicorn horn, he ends up in a cell with Maddog, a pretty young thief. It’s lust at first sight for Vorgell—but honestly, he can’t help it. Unicorn horn is a potent aphrodisiac, and now he can’t stop thinking about sex. Luckily, Madd is one male witch who knows how to put Vorgell’s new magical body to good use when he tricks Vorgell into a kiss that helps them escape... moreAfter Vorgell the barbarian fucks himself with a unicorn horn, he ends up in a cell with Maddog, a pretty young thief. It’s lust at first sight for Vorgell—but honestly, he can’t help it. Unicorn horn is a potent aphrodisiac, and now he can’t stop thinking about sex. Luckily, Madd is one male witch who knows how to put Vorgell’s new magical body to good use when he tricks Vorgell into a kiss that helps them escape. Vorgell may desire sex in general—and Madd in particular—but Madd has no intention of being screwed by a man twice his size. He has problems of his own, including an enchanted collar that causes him to desire his most hated enemy. He wants that collar off as soon as possible, but that requires stealing a basilisk egg from the castle they just escaped. Drawn together by lust and magic, the two men join forces and soon find themselves up to their necks in witches, wizards, and trouble. Vorgell and Madd might just be perfect for each other, but first they have to survive long enough to find out. less

Sequel to Thick as Theives