Bumpy car ride with my sister on my lap

Hello, I am a typical 23 year old boy ( 6’1 ). It was 19 December 2021, Me and my family we travelling back home from a family function which was quite far from our home. We were travelling home with 7 people in car. We drove for 10 mins normally but after that we all felt uncomfortable sitting like that, so my sister was asked to hop on my lap since I was the only one capable of putting her on my lap. She was my relative sister who was 6years older than me and was also married. She was wearing a saree ( black and red ) and she hopped on my lap and the fun began.

She sat on the front parts of my thighs at first but slowly her ass came up to my stomach. I was wearing black jeans and white T-shirt. As soon as her ass came up to my stomach I started imagining dirty things that I have watch on the internet. As I started imagining those things I stared to get a boner. Since the roads were not great, there were many bumpy ones. The first time a bumpy road came, I was having a boner. Her ass was right above my dick and I count do anything. The jumpiness made my semi hard dick rub her saree ass. Since I was wearing jeans and she was wearing saree I think she count feel my boner. The same thing happened many times. After a while she was trying to fix the back of her saree, her hand touched my dick and she was trying to grab my jeans thinking that she was touching her saree. After that I got so horny that I seriously wanted to fuck her in the car but I couldn’t. We found a nearby home stay and decided to call it a night. The next morning we decide to start riding back home. Due to the incident yesterday I was thinking about not wearing an underwear and wearing a thin trousers. I wore the thin trousers and hopped in to the car. I was ready to put the relative sister on my lap. She was wearing a black hoodie and black yoga pants. I was so excited about the thing to happen again. The car ride started and I already had a boner. My dick was so hard the I knew she could feel it since she as looking back at me every time I do the muscle duck movement. I bet It was done to our clothes. I did the thing on bumpy road and I also know that she was having quite fun although her husband was driving the car right Infront of her. That day I realised that I had got a Slut Relative.