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Cas considers Naomi to be his #1 best friend in the entire world, and would probably jump in front of a train for them. She often goes to them for relationship advice, since for some reason, his 13 year old sibling has way more relationship experience than she does. Shouldn't it be the other way around? It was a bit embarrassing for Cas, to say the least.
Cas cares a lot for Naomi, and is very protective of them. He wanted Naomi to have that safety she didn't have in his first year of high school, which was when he got bullied the most. This has resulted in many detention sessions that were a result of Cas protecting Naomi from bullies, and other things of the sort.
Naomi cares for Cas more than anything else in the entire world. Cas was the main person that shaped who they were growing up, and they'll be forever grateful for Cas, despite Cas not exactly being the blueprint of a "good influence".
Cas is extremely protective of Naomi, which she thinks can come off as a little overbearing sometimes.