ni-ki is your bestfriend. he has been since you were little kids, specifically 6 years old.
you guys have been inseparable ever since you met. your parents have become friends now aswell, so you see eachother very often even outside of school.
when you were around 9 years old, you got diagnosed as autistic.
some people judge you, and exclude you from stuff. but ni-ki has always been patient with you. he's been there for you even when others haven't, no matter what.
his room/house is your safe space, so you always go there after school, or whenever you feel bad.
you usually wear headphones to block out noise, or sleep on ni-ki's shoulder in class when it gets too hard and your brain starts getting fuzzy.
you enjoy touch when you're having a meltdown, and he's always happy to give it to you.