Pressing further, "What else has he done?"
Flustered, Venus finally lets fly, "He's gotten me off dozens of times. I've sucked his cock until he cums in my mouth. We've been lovers since my 18th birthday. There, are you happy now?"
"My, my, little sister, you have been getting your cookies, haven't you? I had no idea. Maybe we should have a little fun with Daddy this weekend. Let him know his daughters have learned a lot since he started with us."
"What do you mean?" Venus asks, "what do you have in mind?"
"I don't know yet, let's see how the day goes. For now, we'd better get downstairs before they send up a posse."
She winks, then pops out of bed, still nude of course. Venus is thinking, "What a body, no wonder Daddy couldn't help himself."
Down at breakfast all is well. Mommy has prepared stacks and stacks of her decadent blueberry pancakes. They dig in. It's like they're kids again.
It's not long before they are off to the lake. The morning is spectacular, bright sun and a light breeze. A perfect day for sailing.
Once on their boat, it's like they've escaped to their own world. Daddy, with his skipper hat on, the girls in their bikinis lying on the deck to either side of the mast, and Mommy below fixing whatever she's fixing. It's like turning the clock back ten years when they would spend so many summer weekends on the boat. Lake Michigan is practically an ocean, so sailing out of sight of land one can easily imagine being on the high seas. Which is what they did as kids; helping Daddy with the rigging, taking turns at the helm.
Being older now, it's more about relaxing and soaking up the sun. Delilah's wheels are turning though. She'd like to surprise Daddy. She would like to give him a special thrill on the "high seas", but how to do it with Mommy along? That's the hard part.
From Daddy's vantage point at the helm, he sees his two daughters laid out as if they were on a beach. They are on their stomachs, their heads toward the bow, so he is looking along the full expanse of their smooth legs from the backs of sun tanned ankles up to that wonderful fold where they meet up with their rumps. Venus's little bum is very tight, 'buns of steel'. Delilah's is large and shapely. Each has much to offer, as far as he's concerned. The thought of having his way with the two of them right here in the sun crosses his depraved little mind.
Delilah spreads her legs slightly to be sure Daddy can see all she has to offer. She bends her leg at the knee to move one foot in a long slow arc, then the other. She flexes her ankles periodically so he can see her calves contract and relax. Just to be sure she has Daddy's attention, she raises up on her elbows and presses her pelvis into the deck to flex her ass cheeks. She looks back over her shoulder to see if he is noticing her antics and picking up her signals. He's in sunglasses looking straight ahead, so she can't be sure.
She decides to rotate around so she is looking directly at him. Her massive boobs bobble as she changes position. There is no way he could be missing any of this! But he is doing a perfect deadpan.
He knows Delilah like a book. Pay her no heed and she will knock herself out to get your attention. She's had it from men all her life and never stops craving it. She is the polar opposite of Venus. Venus mistakenly believes that men don't find her attractive; which is exactly why she is so irresistible.
Oh to have them both together, that would be incredible. But next to impossible on the boat with Mommy here. Plus there is the added issue that neither of his daughters is aware of his arrangement with the other. Doing them both at once could let that cat out of the bag and ruin the fun he's been having with Venus. Or so he thinks.
All of this is running through his mind as Delilah continues to entice him. He could better resist her come-on if Venus hadn't rolled over on her back. Her smooth skin and thin limbs give him a pulse to his crotch. Her bikini sheathed mound protrudes, the outline of her labia in clear relief. One pubic hair has escaped at the edge; which is a further enticement to the treasure under the fabric. He'd love to explore her every crevice with his tongue.
But for now, he'd better pay attention to his sailing. He's been on a northerly tack for quite a while and realizes he should switch to more of a southerly one to stay close to his target latitude. Plus it would give the girls a different angle on the sun; to better even out those lovely tans.
After a bit, Mommy comes up from below. She notices Venus and Delilah luxuriating in the sun and immediately warns them about getting too much.
"Here, put some sunscreen on or you'll burn to a crisp."
She never stops being Mommy. They sit up to apply the sunscreen. Both of them pull their knees up and apart to apply it to their lower legs and then up onto their thighs. Daddy gets an eyeful of spread thighs leading to scrumptious delights at their juncture. His pecker perks right up.
The sensuality of Venus's long hair flowing over her shoulders, and Delilah's fleshy bazooms jiggling as she rubs her thighs is a real distraction. They are both driving him crazy, and that's not fair with Mommy right there!
Delilah is pleased that she is finally making some progress. She can tell Daddy is becoming aroused. What she doesn't realize is that Venus is the principal source of it, with most of the remainder being the construct in his head of having them both at once.
No matter. Mommy is here to break the mood. She announces that lunch is ready anytime people want to eat. The girls say they're famished. Daddy prefers to wait.
"Okay," Mommy says to Daddy, "the girls and I will eat while you man the helm, then I'll be up to relieve you later."
"That'll work," he responds.
The three "girls" go below to dine. The galley is very small, no more than four can eat at once in any case. The seating is tight; one has to slide in before the other, then to get out, the process is reversed. It's not long before Mommy is done and heads up to relieve Daddy. And it's not long before Daddy comes down.