At this point, he's just mucking around with the ball on his own, so he's perfectly happy to be distracted by the arrival of someone else and he smiles down at Aigis as she comes over. He's seen her around, of course, but they've never really talked - so there's no time like the present!
"Of course," he smiles, bouncing the ball from hand to hand as he turns to face her. She's... a little overdressed, but he can work around that. "It's pretty simple, really. You just have to get the ball over the net and try and get it on the ground on the other side. And the other person, or team, has to try and stop you."
((OOC: This is about the sum of my knowledge of volleyball, but I'm willing to try and fudge it if you are! *g*))