After coaxing Sans back, you left him to talk to his 'brother'. "How did you-"
"You should know by now, never to question my methods. His main issue is ptsd. I'll first gain his trust as doctor and patient, seeing as he has some trust issues as well. I'll be coaxing him into the idea that his brother is... gone, and then I will work on his phantom pains. After that we'll see what more needs to be done." You explained. The monsters stared as you left them in the hall to set up a schedule with Sans.

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"Good morning, Sans." You greeted the half asleep skeleton the next day. "good morning, doctor [L/N]..." He slurred in reply, rubbing the sleep out of his sockets. "What do you want to do today?" You asked, taking a seat. He blinked up at you. "me?" He asked. "Yes, today is about you. What you want to do or say. Think of it as an icebreaker. A way for me to get to know you and vice versa. "so... i can ask you questions too?" You nodded. "Yep. I'm open to your questions, thoughts, and suggestions." His eyelights sparkled. "n-no body's ever told me that before.."
"I'm one in a million, I guess." You shrugged. "So. What do you want to do?" You asked patiently. He hummed. "um.. i'm hungry." You smiled. "Then let's hit the cafeteria." He hopped onto his paws, tail wagging swiftly. "really!?"
"Yes really. Come on." He was almost like a child as he looked, and touched, everything. You supposed he didn't get the opportunity to roam often, so you didn't question it to much. You simply watched with amused interest. If he noticed, he didn't seem to care.

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After breakfast he wanted to watch something and relax. So you put on Mettaton for him. "bleh." Sans... apparently didn't like Mettaton. "i don't get why you like this pap, he's overdramatic, overdoes everything, and never let's anyone else have the spotlight." Sans argued with nothing. You felt sad, and wanted to say something about it, but he wasn’t there yet, you could tell. You had to wait a little longer. You had to be patient. "what do you like to watch, dr. [L/N]?"
"Hm. I prefer [F/T/S]." (Favorite/Television/Show) He tilted his head. "huh. interesting."

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After that the show was promptly changed, with Papyrus permission, to your show which coincidentally was on. That made it all the harder for you to focus on Sans as it was getting rather suspenseful. Sans watched in amusement as you tried and failed not to get hooked. "heh. that's cute, don't you think, pap?" He asked before turning to the TV himself to check it out. It was a good show, he decided, with a decent plot line, good acting, and a fine set of characters. (I know they are in the underground, please just go with it.)

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Eventually the TV was shut off and Sans asked to be read a story. Ultimately he chose out Fluffy Bunny, seeing as it was Papyrus favorite. You read the story and reading time became nap time. For extra measure, you stroked his skull. According to witnesses, files, and footage you've seen, Sans tended to get into one of his hysterical states when he was asleep. So hopefully, as long as you kept doing this, he 'wouldn't hurt'. You wondered how he'd gotten to this point in the first place? Something that you'd have to coax out later, when he was ready, you supposed. When he did wake up again, he just laid their, enjoying the feeling of your hand on his skull. "were you doing that the whole time..?"
"I was. To make sure you wouldn't hurt again. Did it work?" You asked. He gave a nod as he tilted his head in an adorable fashion. "you know what?" Sans asked suddenly. "What, Sans?" You replied, looking at him curiously.
"today was a good day. we should play games tomorrow." You smiled. "Sounds like a plan, Sans. I'm glad you had a good day."