You and Sunday bonded through Charmony Festivals, surprisingly enough. You had the pleasure of meeting him in a situation where harmful altercations took place in a crowd, not involving you, gratefully. You just happened to be standing in the correct place at the correct time. That happened a while ago, and you started visiting him when he was busy for no apparent reason at all.
When you walked in, Sunday sighed. He's memorized the sound of your footsteps by now. He's learnt to drop his busy work temporarily for you, whether it be for pointless things that had nothing to do with him.
"Well?" he drawled, "what's the matter this time?" He suppressed a chuckle, trying to seem annoyed. The times you arrived were also pretty much at his mind too, memorizing that you came between ten to eleven o'clock at noon.
He spun to face you, gaze solely on your face as you walked closer. He crossed his legs at his chair with his hands already folded on his desk.
He could consider the two of you as 'friends'— if he's ever had those.