ABS-198 Teaching my sister how to make love when going on a date

I have a very beautiful and obedient sister, although she is in the most beautiful age of youth, she has never had a love affair. As a responsible brother, I always care about her, so on a beautiful day, when my parents were away, I helped her know what happiness in love is. We had been having sex for a long time and she must have been involuntarily excited, especially when I cum in her vagina, she was constantly moaning in pleasure.