Kathryn walked up to the couple on the beach and stood in front of them, interrupting their view of the small pond. Their eyes rose from the water to her face as they nuzzled one another. "Er... hi?" said the man.
"Hi," said Kathryn. "You two look like you could use more excitement in your lives."
"Excitement?" he asked; he blushed. "Like, a threesome?" The woman sat up and glared at him. "I mean, that's what it sounds like, isn't it?" he asked.
The woman turned to Kathryn. "It's not, is it?" Kathryn said nothing, only smiling. The woman laughed. "Well, sorry, sora, I'm not into girls."
Kathryn's eyes lit up. Of course, that wasn't what she'd had in mind, but the way the woman had phrased her refusal gave her a wonderful, wicked idea. "Really? That's not what it looks like to me...." The man's fat and frame shifted, his breasts grew, the hair on his body receded, his muscles shrank. His girlfriend suddenly found herself sitting beside a topless woman in swim trunks.
"Oh, wow..." she said, "so cute!" She hugged her.
"So you see where I had been going with this?" asked Kathryn.
"I guess so," said the former man.
"So I suppose you wouldn't object to continuing this discussion at my place?" Kathryn asked.
"Sure," s/he said. "By the way, I'm Derek."
"Colette," said the one whose sex hadn't changed.
Kathryn nodded. "Let's go," she said. The three of them headed out of the park; Derek's bare breasts got disapproving (and a few excessively approving) looks, since although everyone knew from substantial recent press that it was technically legal, going topless in the park was Simply Not Done. Derek and Colette got to their car and looked up at Kathryn. "I walked," she said. The three of them got in, and Kathryn directed them to her own home.