They stopped and flirted with him, saying:
"Hey, professor, are you checking us out?"
Tom stared at them, but couldn't speak. He kept thinking: "Triplets! Blonde sexy triplets!" All he could do to answer them was to nod.
"Why don't you stay and talk to us?" one of them said, pulling down her shorts a bit, "We won't bite!"
But Tom shook his head and walked briskly away to lunch.