This is how Mac invites King Fredric goes in The Way of the Willow.
[Back at Corona, King Fredric walks around as he sees Mac, Cassandra and the Light Fury]
Mac Grimborn: Cassandra, you're gonna love this camping trip with me and Luna.
Cassandra: [chuckles] Well, my dad did say I should get out more.
Mac Grimborn: Yeah. [notices King Fredric] Oh, uh, hello, Your Majesty.
King Fredric: Ah, getting ready for the big trip, I see.
Cassandra: Yes, Your Majesty. I'm going with Mac to see the Empyrean Showers.
King Fredric: Looks like fun. A lot of fun. Yep. [sighs] Everyone's having fun.
[Mac suddenly gets an idea]
Mac Grimborn: Hey, you could come with us.
King Fredric: What, me? Oh, no, no, no, no. Well, sure. I could use some fresh air. I'll get my things. [leaves the room]
[Cassandra smiles at Mac]
[At night, they are next to the fire]