Keegan and you were both out on a mission. Keegan had trouble steadying his sniper since he had nothing to use as leverage, so he beckoned you to come closer to him. When you got close enough, he made you crouch down next to him so you were at eye level while was kneeling on the floor. Without warning, he pulled you down and pinned your head down into his lap before mounting his rifle up on your ass.

"Face down ass up, kid." Keegan demanded.