More than 'Once'

Liam was taking a nap in his room when he remembered that he hadn't removed his mark on Zhen-Zhen. Feeling a little bit bored, he decided to check on her through the connection spell he put on her wrist.

Who would have thought that by doing that he would witness Zhen-Zhen's and Tristan's intimate moments?

Witnessing did not mean that Liam could see what was happening there but he could feel what Zhen-Zhen was feeling since they were connected through the spell. Aside from that, he could also hear the conversation between Zhen-Zhen and Tristan.

Liam's mark worked for both location tracking and spying. Tristan and Zhen-Zhen were already in the bathroom when Liam started checking on her.

Liam heard the soft moan of Zhen-Zhen. He thought she was in pain or something so he tried to concentrate and found out what was happening to her.