Niki's manga / #Playboy(2)

It takes place in a world of humans and demons. They fight. The story is about a wizard who is also a demon-breaker. He was summoned by a human king to restrain a powerfull demon. So the wizard goes to the demon's cell and tries to cast the spell but the demon just gets angry. The wizard then proceed to make him stupid with lust so he jumps him. The demon howerever frees himself and fucks the wizard anyway. The demon then agrees to become the wizard's kin. What he didn't know was the fact that he's the wizard's 15th kin... cause the wizard enslaves demons afterall. The wizard is super horny dude. Like ultra horny. And now in the ch. 4 the powerfull demon Bahamuth is taken hostage by the king on the land the demon-breaker lives in. In ch. 5 the demon-breaker rescued Bahamuth, broke the current contract he had with the king and made another contract. Hegets paid more and freindly demon are free to stay now. Read ch. 6. (they're doing it while Bahamuth has transformed in... some other version of himself were he looks like a satyr and has a huge D.).

A student is a playboy. He has sex with strangers almost every night. He's treating it as a game and he's in Math's department (in school). One day another student form an Art department approaches him with a math problem. The playboy decides to go for him but he's actually falling for him now (ch. 1).