Sister In Law

My younger brother married a cute girl . They dated through high school so we all welcomed her in the family for years. I have joked around with her and sometimes some harmless flirting. My brother called me at worked and asked could I go jump start his wife’s car at her work. I knew they had a weak battery so I bought a new battery and put it in her car. She kept saying that she would someway pay me back. I asked her if she had keys to get into the business where she work and she did. I really needed to clean my hands. After clean up flirting I asked her where in the office did she and my brother hid for sex. She smiled and said follow her. We got in a supply room and she started removing my clothes. She started a blow job which I was about to fill her mouth. She told me to lay down which I did. She removed her clothes and got on top. She was hot and wet it wasn’t long we both climaxed. She was so intensed and I could feel her muscles moving. She asked me could I get hard again so I got on top and surprisingly got hard again. I used her until we both cum again. While getting our clothes on she told me next time we would use a condom. She had finished her monthly about a week earlier and hope it was a safe time. We almost got caught because my brother pulled up as we were about to leave. She didn’t get pregnant which I was relieved. Over time we played it smart and could get together for a fling. I didn’t father any of their children but could have if I was selfish. My wife has aged out of sex so my sister in law is the only pussy I get about once a month. I think our flings keeps her sexually active for my brother and I.