Masturbation was one of my favorite hobbies. I like to jack off naked on bed. One evening I was watching naked news channel. I could not resist my lust. I pulled my clothes off and rubbed my cock. I used saliva as lubricant. It was so good. Just then my sister entered my room. Her eyes were bright open. I covered myself with a blanket. I requested her not to tell mom. She said 'I won't tell mom if you put on a full show'. The environment got really hot. I said 'it would be fun if you join me'.
She agreed and dropped her night gown. I was 18 and she was 17 years. She was growing fast. She had quite big breasts and pinkish pussy. She sat beside me spreading her legs. My cock was throbbing hard. She jacked me and I smelled her pussy. I cupped her breasts and sucked them. We had french kiss for a long time on bed. My penis was brushing her pussy. It touched her clitoris. Just then we heard a grumbling noise. It was mom. She came home from the office early. Mom left the room seriously. We dressed quickly and went to see mom in the hall. Mom was very angry. She said incest is bad. I said we were only masturbating. Mom was somewhat cooled. Mom said masturbating is good. But don't go far. It was amazing. Mom agreed. We some times kiss each other in front of mom.