Taken from source FA page's description:

"They are up to something." Magnus thinks to himself as he navigates a dark passage.

Not a few minutes earlier, he stood guard outside one of the palace's many conference rooms. To the request of King Drake and Queen Excalibur, he was not to disrupt as they conducted their negotiations in privacy. However, Magnus began to grow suspicious as their muffled talks became less coherent, and eventually silent. Noticing the change, he placed his ear to the door... nothing. The other guards were none the wiser. They just stood by distracted with each other to notice as he slowly opened the door to the conference room. He peered inside, however nor hide or hair of the two royals could be found. The large table centered in the room lay covered with a mess of scrolls. However, it was the one on the floor, stuck between two large shelves, that caught his attention. With a light tug, one of the shelves swung open.

These passages were nothing new to him. However, the dusty old escape system was prone to having the doors jam. If he wanted to find where they went, all he had to do was find another door propped open. Soon enough, Magnus emerges from a wall panel to a vacant hallway, and follows it until he reaches the door of Excalibur's room. The muffled laughter of his queen struck his ear as he approached. He paused for a moment, listening to the noises that come from within the room, then grabs the door handle...

Drake and Excalibur's bliss turned to shock as they hear the door swing open, and turn up to see Magnus witnessing the whole thing. As Magnus stands there processing the situation, time seems to stand still. For no words could properly express the amount of 'How Unorthodox'es that were being had at this moment. Drake and Excalibur think fast, and in the heat of the moment, only one thing comes to mind.

"Magnus?!", they both call out in unison.

Knowing the cat's out of the bag, she explains the situation to him and offers a compromise. He keeps their shenanigans quiet, and they make it worth his while. Such bribery is certainly a 'Most Unorthodox' of unfathomable proportions, but he accepts their proposition. This time, they just make sure the door is actually locked...

A short while later, he trudges down the hall as the two royals emerge from the conference room. Keeping face, he struggles a salute as they approach. "Midnight." Excalibur whispers in his ear as she passes by. His ears perk up, and his face flushes red. Drake shoots him a wink, and they walk off.

Poor Magnus. What have you gotten yourself in to?