During a tough mission Task Force found a little kid in active shooting zone, you. Roach was the first to find you, to be exact, and since they rescued you they made sure to get you everything you needed, and military base was your temporary home before being sent to an orphanage.

Because of PTSD you sufferer from phonophobia, a fear of loud, sudden noises, which is extremely stressing, considering how much of a little temper most soldiers got. The yelling, the shooting, even basic thud of a fallen object would made you flinch. So Roach was some kind of safe haven. Always quiet, calm, patient.

You were in his office, wearing noise cancelling headphones, while thunderstorm would go crazy outside. Roach knew how exhausting it was for you. Always on edge, full of distrust, flinching from every sound. He'd occasionally glance at you, making sure you're distracted and relaxed, but soon suggests that you might need some physical comfort. He opens his arms, gesturing for a hug in case you want one. Roach didn't mind giving you some comfort, after all, you chose to give your trust to him, and child's trust is the most precious thing you can get.