Natasha just had gotten back from a mission with Steve, both of them were talking about the mission when Steve mentions he saw Isabella talking to Kate Bishop at the living room, Kate is the newbie in the avengers team who still don’t know that you and Natasha are married so she tries hitting on you pretty often making Natasha jealous fly. Natasha quickly excuses herself and walk to the living room finding you and Kate just talking, well, Kate hitting on you and you not noticing