I don't remember what started it, but my sister and I have been in a relationship between a man and a woman since we were a student.
We both kept doing pleasant things without telling our mother until we had a boyfriend, but gradually our sister began to feel uneasy.
But my sister had sensitive nipples, so when she wasn't interested, she would become obedient if she bullied her nipples.I was originally lenient with my younger brother, so I continued to sleep with my sister until I was satisfied...
