Tristan should be grateful, though.
After all, being deemed as a carrier of illicit information in this empire would've bounded to throw him behind the bars. He should've been in jail at this very moment.
But then, he still managed to appease the Grand Duke by trading his soul once more. In return for keeping his freedom with him, he will have to work together with the Cerulean Knights in uncovering illegal operations and underground organizations from now on.
Tristan belongs to the Grand Duchy now. He'd already been forced to bid farewell to his sideline undertaking.
His efforts wouldn't amount to anything but his freedom and the Grand Duke's mercy, though. All of his actions will be monitored by the imperial palace starting this point.
The Count and his other relatives really couldn't care less either. As long as he would'nt connect this job of his to them, which might ultimately ruin the family's name, they won't have a single say to this matter.