I do not trust this man.
1. He's way too nice, and well built to be a random man
2. If he's supposed to act like a captive why the hell would he be picking flowers???
3. He was able to leave the bedroom and wander around the castle without anyone noticing
4. He was the one that reached out to her on their first encounter
5. He's acting real lovey-dovey for the demon lord even tho they've known each for less than a day
6. Peep the cover image, it looks like he has a pair of shadowy horns that she's not aware of. This man crazy