Fiona decided to take a shower in an attempt to cool down her incestuous arousal, and had just gotten undressed when she heard a soft knock at her door.
"Yeah?"
"It's me, sweetheart, can I come in for a moment?", she heard her mother's muffled voice ask.
"Yeah! Come in, Mom!", said Fiona, hastily wrapping a towel around her naked young body.
The door opened and her mother entered the room. She was fully dressed now, but her face still held a rosy flush of sexual excitement.
"Can I talk to you about what happened just now?", asked Janet.
Fiona looked embarrassed and a little frightened. She was certain her mother was going to give her a good chewed-out for spying on them.
"I'm really sorry, Mom!", she spluttered, "I won't ever do it again, honest! I just couldn't help but notice you and Dad fu… um.. doing it!"
Janet smiled at her daughter and sat down on the bed next to her.
"Hey… hey… You're not in any trouble, honey. " she crooned, hugging the girl affectionately. "I'm not going to get mad at you for a little natural adolescent curiosity."
"You're not?"
"No! In fact, your father and I both agree that we should be more open with you rather than trying to hide what we do behind closed doors. Now that you're at that age where girls start to experiment with sex, we both want your first experiences to be as open and as pleasurable as possible."
"You mean you told Daddy I saw you um… s..sucking his thing, just now?" asked Fiona fearfully.
"Sure!", smiled Janet. "He was a little surprised at first, but when I told him about the lecherous way you were staring at his cock, I think he actually started to get hard again."
"MOM! That's disgusting!", exclaimed Fiona, but she couldn't suppress a faint, mischievous little smile at the thought of her father getting aroused by her.
"Not to me it's not, honey," chuckled Janet, "And don't be so smug, I know you want to get your hands on your father's big cock. I could see it in your eyes as you watched me suck him off just now. Am I right?"
Fiona lowered her eyes and nodded silently, squiggling uncomfortably on the bed. Her mother was right, the sight of her Daddy's long, thick erection glistening with saliva and cum had been a tremendous turn-on for the young girl. Even now her little pussy was still itching with arousal at the very thought of her father's huge cock.
"Don't be ashamed, baby" said Janet, hugging her daughter close. "I had the same feelings about my father when I was your age. I guess nearly every little girl does at some stage or another."
"Really?", chirped Fiona, happy that she was not alone in her incestuous fantasies.
"Sure. But not every girl is lucky enough to get a chance to actually do anything about it," said her mother with a sly little grin.
"You don't mean that you and… grandpa… actually…. "
"…fucked?" Janet said, finishing her daughter's question for her.
"We still do, sweetheart. Your grandfather is hardly an old man you know, he's only fifty one and believe me, he can still give your father a run for his money in the bedroom."
Fiona was getting very wet between the legs listening to her mother's startling family revelations. The thought of her big handsome grandfather fucking her mother was intensely arousing to the young girl. She squirmed her ass on the bed and parted her thighs a little, in a vain attempt to alleviate the hot burning itch emanating from her aroused young pussyslit.