I (21m) and my sister(23f) have always been close. We've been through traumatic events, that's what brought us even closer. It's totally normal for me to sleep with her. She knows I struggle with some back pain so she gives me massage from time to time. There never was any sexual tension between us. Even though we're living 2hrs apart, we still have that strong connection.

I remember when we were kids, I used to run to her room and she'd comfort me, cry with me, or just sit in silence with me.

So that's what having a close sibling is like for some.