From Exiled Rebels Scanlations:
On his way home after an evening out drinking, Shiratori Tomoe meets a roughed up man named Zen. He takes him home to tend to him and ends up sleeping with him. The next morning, upon waking up he discovers that Zen left some money and disappeared.
"Is money compensation for sleeping with me!?" Filled with anger, Tomoe starts searching for Zen.
However, the only thing he remembers about him is Zen saying "I want your body warmth." and devouring him like a beast, as well as an exasperated sigh...