Oh, dear. Had her underclassman taken that as a slight?

...From her perspective, Michiru can absolutely see how that would have been possible. She tips her knees towards Haruka as she sits to indicate that the other girl is, in fact, sincerely welcome here. But not too overtly. Wouldn't do to impose.

"And what are you eating?" she asks as she takes up her chopsticks, looking for Haruka's lunch. This is a good topic. Appropriate for the situation. If it's what Haruka would like to use to dispel whatever might be bothering her, Michiru doesn't mind humoring her.