Kids Play Taken To Another Level

When we were kids, my parents often took us to visit grandma in a small midwestern town. She had a separate garage that was really more of a barn with a loft. My little brother and I and a couple of our male friends would get our little sister, his little sister and three other girls, twins and a non twin sister to go up into the loft and play sex games. We would get naked and just play with each other. We'd play truth or dare and make the girls kiss our penis' or rub our penis between their butt cheeks.
One time, one of our friends' older brother came looking for him and found us in the loft. We didn't hear him coming, so he caught us all naked. He took off his clothes, revealing a rather large penis. He was much older than the rest of us. He had us all-boys and girls, take turns rubbing his penis. Then he had the twin girls get in different positions, one laying spread eagle on the floor, the other bent over a chest with her bottom facing him and had the boys watch as the other sister masturbated him and my little sister rubbed his balls.
He told me he wanted me to fuck my little sister. I said I didn't want to (but I really did). He told her to lie down and told me to lick her pussy. I did and I really got horny. He said he could see I was hard and he knew I wanted to fuck her. He said if I didn't fuck her, he would. So I mounted her and it really felt good. I probably didn't last more than five or ten minutes, if even that, before I ejaculated. Then he told all the girls to bend over a table and said he was going to take turns fucking each of them. He was definitely too big (penis and age) to be fucking my little sister. I told him so. He just told me to shut up and watch. Since my sister was already lubricated with my sperm, he started with her. He had to cup his hand over her mouth to keep her from screaming as he forced his penis into her. She arched her back and I could tell from the look on her face that it was not a pleasant experience for her. He wasn't being very gentle with her. He was doing all he could to get every inch of his penis into her. I could see blood on his penis. He really tore her up. I hate to admit it, but I was aroused watching his huge penis disappearing into my sister's little pussy and coming back out with blood all over it. I was starting to get hard again. He told the other boys to fuck the other girls to get them ready for him. They obliged. He took turns fucking each of the girls for about five minutes or so. When he was ready to cum, he was in Tessie-one of the twins. He told Terri, the other twin to lick and suck his balls while he was fucking Tessie to help him cum. When he started to cum, he pulled out and grabbed Terri's head and forced the head of his penis into her mouth and she gagged as he ejaculated into her mouth. She pulled back and he shot a couple more big jets of cum all over her face. After he was done, he had the rest of the boys fuck the girls while he watched and jerked off. I had Mary, the third sister, suck me off while one of the other boys was fucking her. She knew how to suck and swallowed when I ejaculated. I think their brother must have been messing with them because they weren't virgins.

We never told anyone what happened that day.

We ended up having little orgies up in that loft for about three summers. I think one of the twins ended up getting pregnant.