Prompt was “Celestia has anger issues”.
“Sister.” Luna took a deep breath, trying her best to navigate what could easily be a terrible conversation. “Is there something you wish to speak of?”
From across the breakfast table, Celestia blinked. “What do you mean, Luna?”
Luna cleared her throat. “I sense…” Careful, Luna, careful. “I sense something is amiss with you. An agitation deep within you. An agitation that should be dealt with as it may… surface in unwelcome ways.”
Celestia frowned. “Agitation? I’m perfectly fine,” she replied. “Where is this coming from?” Her frown deepened. “I trust you have not been violating the privacy of my dreams, have you?”
“I would never dream of it, sister. I resent the thought,” Luna replied, somewhat miffed. But persevering, nevertheless. “It is not your dreams that I’m concerned over.”
“Then, what?” Celestia asked. “Stop being so evasive.”
Luna sighed. All right. Well. Right. Okay.
“I’ll get straight to it, then,” Luna replied, politely. “I am concerned about Silver Aster.”
Celestia blinked, confused. “Silver? The night guard?”
“Yes,” Luna replied. “You play late-night chess with him, do you not? Before you retire to your chambers.”
“Why, yes. Or, I used to, at the very least, after Amethyst got too busy to play. Though now he’s been too busy as well to play as of lat–“
“He’s not too busy,” Luna interrupted.
“No. And neither was Amethyst.”
“What? How do you know?” she asked, the frown returned. “And what in Equestria does this have to do with my so-called agitation?”
“Celestia,” Luna said, “you are such a viciously sore loser, you are giving your guards nightmares. You are hilariously bad at board games, and I implore you to come to terms with the fact lest our security screams at the sight of a checkered floor.”
“PARDON MEEEE?” Celestia gasped, loudly, slamming her hoof against the table, “I’LL HAVE YOU KNOW, LUNA, THAT I AM NOT BAD AT BOARD GAMES!”