Leah doing sports

He stopped in his tracks when he saw his younger sister Leah working out in the living room. And oh boy, did her ass look toned!

Immediately Jacob felt the blood rushing from his head to his dick. In mere seconds, his big dick rose to full attention. The monster was alive again! His cheeks were also graced with a rush of blood as he felt his huge cock stiffen. In an attempt to ease the tention which he felt and that his sister likely would feel once she became aware of his presence, he tried to make conversation. "Um, hey sis, uh... Have you been doing any more squats recently? Your a- butt is looking very se- fit today..." Jacob said with a nervous laugh

"Yeah. Leah always wanted a bigger booty to finish off her killer bikini body..." 'Leah' said, turning around to look at her 'brother'.

"Uh... sis? Since when did you refer to yourself in third person?" Jacob asked.
"Well, I don't know whether or not it'd be accurate to refer to myself as Leah, considering I'm actually David, just in your sister's hot, fit body." The person who was actually David responded. "Um... It would seem that we have some of the same feelings about Leah, Dad." Jacob said.
"What do you mean?" David asked when she looked down to Jacob's crotch. "Now I see what you mean..." David continued after spotting the bulge made by Jacob's rock-hard boner.