My Younger Brother

When we were young, (my brother a year younger than me), Il at around 8-9 years of my age, I often noticed my mom and dad having sex which interested me a lot. I talked about it with my brother who was also like my best friend. One thing led to another and we started having sex every other day. We did it we were in 13 and one day I just felt him per inside me. Unfortunately, it wasn't pee but semen, he came in me, for at least a month of sex till I somehow managed to know what situation I was in. I took medicine soon afterwards and am fine. Later on we separated due to university and I don't wanna feel awkward either seeing him again.