"When I say go, we sprint to that tree over there," Luke says. You smile cheekily. "Okay," you say. He gives you a confused look, then shakes his head. "Go," he says.

You set off, running as fast as you can to the tree. You get there before Luke does. When he finally catches up, he stops and bends over, panting like a dog. You smile cheekily and pome him on the shoulder. "I win," you say.

Luke looks up, into your eyes, gives you a peck on the lips, then takes off. You gasp, surprised. Then, you set off after him. He stops at a bench and sits down.

"Who's the winner now?"