Mom teach us

I am 22 male. We are 3 siblings- 2 sisters one 24 and another 19. And mom. Dad died when we were younger in accident. But mom managed our house.
After dad passed away she said us that she wished for open family so didn’t allow dress compulsory. So we used to stay naked in summer. Since my sister grew up, my mom and she always have lesbian sex infront of all us. Me and also My younger sister used to learn from mother same pussy eating. Also mom allowed them to play my penis but initially it was too small but also they used to try bj on me to learn. After i cross 14 year, then i started getting boner. That day my whole house celebrated. They began making me cum by bj. I also started feeling pleasure. They all have fun with me. Now after 2 year my mom first tried to have penetration sex and she got it. We had sex just 2 min because it was my first time. But it was great experience.
Next again after few hours my mom taught my elder sister to have sex with me, but we couldn’t do then mom again did sex with me. This time i got 6 min. Next day again my mom tried my sister to have sex . I pushed hard then she cried a lot and blood came out. So we didn’t continue that time but that evening i fucked my sister. Then i used to fuck my mom and sister. My younger sister was still young to have sex. This continues till my another sister turned 17 when she also finally get involved and we 3 then started having sex regularly.