[Soushi feels quite accomplished by receiving her "thank you" because it sounded really lovely the way she said it to his ears. He will have to take note to find a way to get her to say it once more in the future.

Too bad his own bad habit about never receiving gratitude was still in effect.]

No, there is no need to. Nothing will bring me greater joy than to be used when I am needed and to be discarded when I am not, Ushiromiya-sama.

[Literally. Nothing more brings him greater joy than to be used. Said it all with zero shame and filled with happy smiles.]