Dotei Yankee Magicus summary:

On the day Tatsuya greets his twentieth birthday alone, he meets a black cat. He feeds it on a whim and is surprised when it suddenly speaks! Before he knew it, the delinquent-like Tatsuya is transformed into a different person; someone with a pretty face!With a body now capable of forcing a man into heat, he is suddenly attacked by a stranger! Whilst under the spell of the rampaging heat of his body, he is found by his childhood friend Kentarou, who came to celebrate his birthday with him.This body makes a man go into heat... the only way to reverse the spell is with a creampie!