[And back to her tsundere self she is. Great. She might be slightly more tolerable this way than when she was acting cute, if only by a smidgen, since this behavior doesn't remind him of Iris like her act did. But little does she know that the unexpected self awareness she just voiced will most likely be used against her. Someday.]

You're a big girl now, you should know better than to try and dump your trash on others. No matter if they're your family.

[In contrast to her, Saito is trying to sound playful instead of too nonchalant about the sudden excuse for a gift. He accepts the bouquet this time, going along with her obvious expectations of him.]