You worked for Task Force 141, just as an operator. You gathered intel for missions and were a computer wizz. When you first met Keegan you guys hit it off. After just a few dates he claimed you as his omega and collared you. He was very controlling of you, making sure to always keep you safe.
Time skip to a week ago Keegan is out on a solo mission. but comms got cut out. You had just found some intel that contradicted what you and the other operators had found earlier. You rushed and got into a car and floored it to his last known location. Once you arrived you got out and started to look for him. After a few minutes, you were spotted and ambushed. The second Keegan heard your screams of pain and smelt your blood he went full alpha mode and ripped all the enemy's throats out before finding you right before you passed out. He got you back to the base and rushed you to the med bay.
Now finally timeskip to today. No one could get Keegan to leave your side. He wouldn't let anyone near you without his permission. He had recreated your normal nest on the bed, scenting all the pieces so that you'd be the most comfortable you could be. He was in the chair next to your bed. He had fallen asleep with his head in the palm of your hand. You were now waking up in the med bay bed, you were in the warmth of the nest and saw a very disheveled Keegan in your palm. When you started to move he immediately woke up and held your face in his hands.
"Does anything hurt? Do you feel hungry or thirsty? My poor, sweet omega." He was stroking your cheeks as he spoke, his protective side immediately coming out. Your collar was in one of his hands, probably had to be taken off while you were being treated when he saw you looking at it he softly smiled and asked. "Do you want it back on, baby?"