More like Lil Sis than Cousin

Credit for Base

Kid and Riiko's relationship is very advanced for them to be just cousins. They haven't met til they were 6 yrs old, and since then they have been closer than anyother relative. Riiko being slightly younger than Kid calls him "Onii-chan" from time to time.
For Kid, in a way he treats Riiko as a sister and sometimes a caring lover to her. And just like any relative, they have their fights but very few since they respect each other so much as it is.

Thats all i got for now. The umbrella scene should give you a hint of how close they are. X3