Looking for ab old story

Story by booobp

Hi.

I remembered an old story i remember used to be on this site.

It was a Brother/Female/Sis(futa) story, where the brother and girlfriend have his sister involved in a threesome and the sis is extremely well hung. Nothing too crazy happens but i think at the end the girlfriend and sister continue to have sex while the brother watches or something. 

It's a one shot i believe, and not very long. 

Idk if anyone recalls this.