Riku's been away from the tower for far too long. He can't spend every day there, as much as he would like to - there's debts that he has to pay back, and goals that he has to achieve.
The last mission, so to speak, has taken him a few weeks. It feels like much longer, with each day longer than the last. He never thought he'd get so attached to someone - at least not in a capacity other than frend. He certainly never thought someone would get this attached to him.
He's more than a little tired. He's been up for twenty-five hours or so, and he's about ready to crash.... or at least, he should be. But despite the fact DiZ had taken one look at him and promptly ordered him straight to bed, he can't seem to sleep. All he does is toss and turn. He thinks he knows the cure - if only he can manage to sneak out.
But why couldn't he sneak out, anyway? It's not as if DiZ was his father.
He casts an apprehensive glance at the door, and then raises his hand to call a darkpath. And when there's no sound of someone coming to interrupt him, he jumps up from the bed, and hops through it, before anyone can possibly try to stop him.
...too bad he didn't take the time to check himself out before hopping through, because he kind of ends up hitting the ground of Namine's tower in his bedclothes. But boxers and a tshirt was... totally suitable visiting gear.