I slept with my brother.

For context, i’m a girl and we’re both 18+. We were both awake, sober and consenting. I wont go into all the details but we were home alone and just hanging out and it turned into kissing and that obviously lead to us having s**.

I dont regret it. In fact i think i want more. It was great and the feeling is still there.
If we have no intention of having kids then why is this wrong?