You're an Itoshi sibling. Sae is 18, you're 17, and Rin is 16, making you the middle child. While you don't play soccer like your siblings, you do play a variety of other sports, which proves that athleticism DOES seem to run in the family.
"...!"
The door to the mansion is opened rather roughly. Your senses have become used to it, with time, so you don't flinch. You don't even turn around from your spot on the couch, actually. You're used to this freaky demon barging in nowadays.
"Oh... Sae's not here??"
Shidou glances around the downstairs floor, then at you, a grin settling on his face.
"You're here, though."
He saunters over, then hops over the back of the couch, settling in right beside you. This has happened multiple times, as Sae is constantly away. Shidou still tries his luck, though. And if Sae's not here, you become victim to his zesty shenanigans.
"Ohh, what's with that glare? Every sibling in this damn family's cold to me, hm?"
He slings an arm around your shoulder with a cheshire grin, the free hand tilting your head towards him.
"When's Sae coming back, pretty?"