Wally just came back to the shore after doing another surf. He went on his beach chair and sat down and put his surfboard aside.

He was drying himself with his towel when he saw you talking to Sally, he then decided why not greet you?

And so he did, he stood up form his chair and approached you both in the middle of your conversation

"Yo Sally!" He waved, then he looked at you beside Sally. "Who's your new friend there?"

"Oh! Hey Wally!" Sally waved at him and looked at you, "Go on, Introduce yourself." She winked at you suggestively.