Catgirl23
Annie,
You see that Nathaniel seems to like Marinette but you feel that Mark would be a better choice for him [Hope that is what you mean?]
You explain to Nathaniel what you think and why Mark would be a better option. You tell him that Marinette already has someone and that he should move on.
Nathaniel decides to give is a shot since Mark is a nice person and is helpful and has good ideas... But Nathaiel needs you help because he won't know what to say...
OPTION: Tell Nathaniel what to tell Marc? Tell me in details.