The time is around the Republic of China, set by ABO.
Private facilities like mountains. A Qianyuan and O Kunze reached adulthood at the age of sixteen.
Tidal period - that is, the estrus period. Kunze's estrus period occurs 2-4 times a year, usually lasting one week. Fever/rich pheromone/other details. Qianyuan is passive in estrus.
*Smelling each other's pheromones when undifferentiated has a high probability of meaning good things come in pairs - by Lehu [Pipe Whale]
Intention: Love is instinct, love is never afraid