Natasha and Bucky were sat next to each other at a table (possibly in a kitchen?), and Tony was nearby. Natasha was speaking Russian to Bucky, and the text basically translated to 'say something in Russian'- she was teasing/winding up Tony, who was saying 'it's not nice to speak about others/laugh at people behind their back'.
Anyone recognise this? It's not this very similar one by bluewindsummer, it was a single panel comic.