Why is this getting increasingly shounen-ized? The "introduce a new clinically insane suitor to challenge Fooly's love and in his rejection further his relationship with Leo" dynamic is getting old fast. I sure hope this is the last before the story changes gears.
The comment about him getting skinny is most likely general xoncern about whether he's been doing well and getting enough food and sleep. Also she isn't flabby as you can see in the last page. Non-muscular girls tend to have folds like that in those positions. Poor Fleur though. She never catches a break.
Title should be "The Imperial Knight and an Attack" as Leo is not present and Fleur has always been referred to as Imperial Knight in previous chapter titles.