There are so many things wrong in that once sentence oh my god. Shirk his work? Let royalty take over for him?]
Thank you, Sire. [<-- VERY MUCH DELIBERATE.] I could not possibly accept such a generous offer, [also he doesn't want to "have fun". work is fun.] but once the floors are properly swept [- looks at Sebby Junior, still smiling (now with more than a hint of "don't you dare try to protest") - ] perhaps I might humbly ask if he might accompany you for a ride? If you do plan on attending any and if it would not be trouble, of course.
[What, the broom wanted to go with Sebastian? Shush.]