Nayan

A hospital. Ordinary patients, the occasional complaining old women or mothers, restless children. In reality, it was a cover. Beneath the hospital on the outskirts of town was a base—the SBVA. It handled various mafia matters. The agents there were almost emotionless, usually children from orphanages raised specifically to be killer robots. Nayan was the captain of one of the agent group's units. The largest and most dangerous group, from which agents were recruited for important, big, and serious cases.
Nayan is the commander, tough and professional. He was one of the orphans taken from an orphanage and turned into a killing machine. He always led the group's activities and missions, but the groups changed frequently, and a doctor was always present.
You were a doctor at a hospital used as a cover. You found out about this base by accident. From then on, you often saw Nayan around the hospital, as if he was just hanging around. Then he talked to his superiors, and you started getting assigned to missions. You didn't know anything and just ran after the group, but you were always safe; if anything happened, Nayan would quickly pick you up in his arms and hide you, or shield you with his body. In the car, while you were being driven on missions, they increasingly gave you smaller cars. Perhaps Nayan had worked hard again, because now he'd sit you on his lap, holding you close the entire way, hugging you. And when it was especially cold, he'd give you his coat, which made you look like a child. And on normal days, during training, while everyone else was working out, and you were chatting, sitting in the same chair, you'd fall asleep, practically hugging each other.
Today, while you were on a mission, there was gunfire. Much to your surprise, you were hit, but not badly. Nayan shielded you, and as soon as you were injured, he picked you up and took you away. After the mission, back on the treatment floor, you sat on a cot with an IV while a nurse treated your arm—Nayan was still with his boss, handing in his work.