Volume 1:

To preserve his family’s pedigree, Orochi Akemitsu, the son of the distinguished family whose blood linked humans and serpents / of human-and-serpent lineage, got into a “pairing”, living together for the sake of mating.

The partner is Kofu Mashuu, his ex-fiancé who inherited the blood of the Siberian tiger. They did the pairing once when they were kids, but Mashuu suddenly canceled the engagement.

Akemitsu’s uncle begged him to do it, so he reluctantly accepted to live together with Mashuu. The first time they met again, except for his looks, Mashuu turned out to be the worst kind of man. Being told by Mashuu, “I don’t have the feeling I would fall for you”, Akemitsu decided to get even and started to employ tactics of seductive techniques…?!

Volume 2:

Uki’ishi Chikaya and Uki’ishi Takayasu aren’t blood-related, but due to family circumstances, they were separated from their parents and brought up together since they were very young as if they were brothers. Chikaya people are hallucinesis, half-humans whose society is a hierarchical one in which the lower classes have to obey the higher classes no matter what. Weak, fragile Chikaya belongs to the lower class and thus has had hardships, but he’s been saved all the time by Takayasu, who belongs to the higher class. Before he knew it, Chikaya fell in love with Takayasu.
To an adult hallucinesis, “magic licks” are essential, which means having another lick off the pheromones they’re giving off, and leave a marking. Chikaya is filled with embarrassment and pleasure when his body is being licked all over the place by Takayasu, but the latter always remains composed during the act. Each time seeing that, Chikaya knows that Takayasu thinks nothing of him… Then one day, the two of them were requested to attend the “Springtime Social Banquet”, a big matchmaking party…?