My sister got a condom from her health class and asked me to practice with her, so I couldn't refuse and just took off my clothes to help her out. I thought we were good to go after successfully putting it on, but then her demeanor changed! She straddled me, saying, "I used protection, so it's fine to have sex, right?" But then it broke in the middle, leaving us exposed! To make matters worse, she got even more turned on and we ended up finishing inside her. This feels like an act of God, right? My sister was the one who wanted to do it!