Is it odd how close I'm with my big sister?

My big sister has been suffering from anxiety and depression, I've been trying to help her. We used to be really close growing up but grew apart as teenagers. We've become closer again and she likes spending time together, especially being close to me and cuddling.

Honestly I don't mind it since she feels so safe with me and it seems to help her. Our parents are really happy about us and have encouraged us to bond more.

Is it odd to be this close to your sibling as adults? Should I try create a bit more space?

I'm open to chat more about this, PM me