Yup so actually, I discovered this artwork in a fanfic I was reading on Ao3. I've tried looking for it, but couldn't find it :/

It's somewhat like this -
Dean is Sammy's older brother who takes care of him, but the agency/services has to take Sam away because Dean lost his job. And Dean has no legal right over him or something, because they ran away from their abusive alcoholic father. So at the service thing, Castiel is called in to take after Sammy, and well they basically meet by Dean coming to visit him. There's these two memorizable scenes; 1. Dean and Cas go to laser tag (image above) 2. They are making pizza for dinner and Dean tries to spin the pizza, and it ends up falling on his head (image below). Uhh, that's all I remember folks.

If anyone knows the fanfic, comment below for the info other readers might love xD