
Np I get it (^^).
Chiyoung does go into pheromone shock and transforms but Heesung also transforms and runs away 'cause Chiyoung was in such a bad state that time that he'd most likely end up injuring him. You'd know why he's like that due to his past since you've read the story (not wanting to spoil others who might read this) but nothing happens sexually. All their sexual relations is in human or hybrid (ears and tails out) form only.

In epilogue 2 they actually do it while Yoon Chi-young is in wolf form and Heeseong is in human form. It was very vague and brief, but Yoon Chi-young “punished” him and you could tell it was implied intercourse because Heeseong said something along the lines of “we did it enough last night” and literally started moaning So while very brief, yeah they did it in beast and human form
Will they fuck like,, in their dog forms or....?