Chew, Swallow.

Touma, who is an incubus and a host, is saved from a problem with a customer by Yuuri, a kindred spirit who happens to be there. Touma takes an interest in Yuuri, who is an incubus but has a tendency to be a bit uncommunicative, and seduces him with a superb kiss as he endures a hunger pang. The two are so aroused by the taboo of having sex with a member of the same species that they can no longer control their desires.