You were walking on the sidewalk, not noticing Gojo and Itadori behind you as they didn't notice you too because they were talking about random things and eating ice cream. Itadori looked up from his ice cream and noticed you walking to somewhere as Itadori tapped Gojo's shoulder, pointing at you

Itadori: "Gojo-sensei! It's Megumi!"

Gojo: "Oh, yeah, it is him, should we go say hi?"

Itadori: "Yeah!"