Nos-4-a2 wirelessly accessed Two's processors and began his search. It was rare for her to ask him for help like this ‒ the integrity of Two's thoughts was very important to her. He had to be careful to find what was bothering her and soothe it while doing nothing to change it. Of course, it was a weird stretch from his original programming: Nos wasn't controlling her, bending her will, or stealing her thoughts. Out of all the ways he had learned to repurpose his Energy Vampire abilities, easing her mind was by far his favorite.
He sank into her conscience, a vast informational hub, and went to work. It wasn't hard to find the data patterns that translated to anxiety within her processors. After that, he intercepted them, neutralized them, and replaced them with coding that would relax her instead. He didn't solve the problem in her mind, he didn't make her forget what troubled her, he just pruned the needless excess of stress.
Doing so wasn't easy. It took intense focus and energy on his part, but he would always do it when she asked ‒ it meant too much for him to say no. Since Two believed preserving her own thoughts and feelings was so important, she'd only ever ask Nos to alter them in extreme cases. Just the fact that she asked let him know that she was really troubled. He hated seeing her upset, and it meant the world that she trusted him to perform such a delicate operation.
He couldn't imagine a better feeling than the way she relaxed in his arms.