I completely understand what you mean about finding your own space within the blended family dynamic. It's like, you want to be involved and supportive as a step-parent, but at the same time, you don't want to overstep or feel like you're imposing on the natural parent-child relationship.
For me, it was really helpful when my partner and I had some open and honest conversations about our boundaries and expectations. We talked about how we wanted me to be involved in my step-child's life, and what that would look like in practical terms. Things like setting up regular check-ins with the child, being clear about my role as a step-parent, and making it okay for them to express emotions or feelings around me.
I think one of the biggest takeaways from this experience is that it's not always a traditional family unit setup, which can be helpful to remember when you're navigating these dynamics. It might mean adjusting your own expectations, or being more intentional about how you interact with the child and your partner. But ultimately, I do feel like it's led to some really special experiences for all of us, and deepened our connection as a family.