Who: Loki and Ysa
What: "It's a playground," Sif tells him. "You have to play!"
When: Late, late at night, after Loki's arrival (5/8/12 realtime)
Where: On the playground
Rating: Loki and a PTB are talking; what do you think?
He waits until the middle of the night, of course – waits until his senses tell him that everyone is asleep, or at least otherwise occupied in their apartments. He waits until he knows that no one is out on the grounds, and no one will notice his presence there. He waits a few minutes longer, just to be sure, because with Thor as an older brother he has long since learned patience.
( And then Loki steals out into the playground... )