Tonks
"Sirius! Are you ready to go?"
"Coming!"
Remus had told her all about his walk with Sirius and she had come prepared.
She sat down of the bottom stair and donned a pair of pink and purple roller skates. She looked in the hallway mirror and adjusted her hair to match her skates.
Padfoot barked once to get her attention. She turned to see him sitting at the top of the stairs.
"Hey! Ready for your walk?"
He barked again, and then trotted down the stairs.
She hooked him to the lead, rolled out the door, and stumbled down the front steps.
"Okay, Sirius... Mush!"
Padfoot bolted. He charged down the block to the corner, Tonks hurtling along behind him. He paused for a moment at the corner, looked both ways, and then took off again.
Tonks slowed down when Padfoot stopped, and then the lead jerked her back into motion.
"Go, Sirius, go!"
They raced toward Regent's Park, faster than one would guess a dog could run. Tonks swung around corners, out into the street, where she was nearly hit by more than one car. She nearly took out more than one pedestrian, and did in fact knock down a postman, sending up a cloud of envelopes.
"Sorry!" Tonks shouted behind her.
Once in the park, Padfoot ran around the Inner Circle and past the college. When they started towards the boating lake, still traveling at breakneck speed, Tonks started to wonder if Sirius was getting tired. He couldn't possibly be in this good of shape after over six months trapped in the house.
She was jolted out of this thought when Padfoot suddenly veered left onto the frozen lawn.
"Sirius?" She scrabbled along on her roller skates in the crunchy grass. She focused on her feet to keep herself upright.
Tonks looked up again to see the boating lake coming up fast.
"Sirius!"
Padfoot stopped short, a few feet from the lake, and flopped onto the ground, panting. However, he had miscalculated how long it would take a rolling Tonks to come to a full stop.
When she flew past him, he realized he was still attached to the lead. He yelped as the lead dragged him back into motion.
Tonks tripped over the edge of the ground into the lake, yanking Padfoot behind her. They both landed with a splash.
Padfoot gave a dirty look to his cousin.
"Don't give me that look. You're the one who ran us into the lake."