Keegan was complaining about something about the mission as usual, it annoyed you but didn't say anything besides telling him to keep it to himself. He would shut up for a bit before doing it again. Only because he had a slight soft side for you

You and your team had just finished another mission and was now at base to relax after the exhausting mission. And of course Keegan was complaining again to you

"Get down on your fucking knees and shut up." You snapped