"Oh yes, what a lucky girl, so nice to keeping it all in the family and full-filling sister's desire to have her brother cum in her virgin vagina filling it with his potent baby batter and who knows, sometimes that first time can and does put a bun in a girl's fertile oven, so might as well try!!"
"No way sis! I'm not falling for that again. Last time I was down there you piss all over my mouth. ( It was a bit of a turn on though...and salty)"
"A couple weeks later they sat us down to let us know that Mom was pregnant. My sisters glanced at each other and at me before they each pulled out a little stick. "We have something to tell you guys too ....""