Adding to the family

I'm not a great sportsman like my brother, but I done a great deal better at school, university and career than he did. He also partied and done drugs, I didn't party or do drugs and so am referred to by my brother as a loser/nerd. He also got married and I haven't found a wife or any girlfriend. As the older brother it sticks out more than if it would if I was the younger brother. But I now have the satisfaction of being a father and albeit my nephew I'm the father of. My brother couldn't get it done as they say, my sister-in-law asked me to help with a sperm donation. Which turn into full sex after I had trouble myself masturbating to a time schedule. So, she came over to assist and we ended up with a direct application by me into her. Followed by several more direct applications, but I had promised to keep it secret from my brother. So, I'm writing this to get off my chest so to speak.