The last day
The suggestion by Cia that had been made was quite honestly one Quinn never thought about. He had always seen Cia as an outsider, even before all of this happened. Unlike the others, she hadn't known his secret and kept it hidden amongst them. So there was no bond, no time spent together, and she was right, there was no trust.
In fact, he was the only one that didn't even want Cia on this trip in the first place, but he had to admit the suggestion itself that was made wasn't a bad one. However, the main reason why he was thinking this was a selfish one.
Quinn was busy thinking about his quest, the quest to become a leader. Most likely completing that quest would come with several rewards, and one of them was to have ten people in the Cursed family. So far, there was Layla, Peter and Leo, which was 3/10. Honestly, to complete this quest, he didn't know who he would turn as there were a few downsides into turning people.