Yes, you slip the fabric aside and let the cock push against her pussy

With the sight of Karianne and the feeling of the girl in your arms, you easily cave to your wants. You stroke your hand from her breast and between you to her back, and she arches it in anticipation while this at the same time seems to grind her harder down on your cock. She sighs and whispers a soft “Mmm,” as you reach her spine and follow it to her sipper. You gently tug it down and note how she starts squirming at being undressed. You stop before coming halfway down, and show your first intent when you slip your hand inside, and reach back around to grasp her breast in your naked hand this time. She mews as her sensitive breasts are touched and leans back against you again, seeming lost in the new sensation to note your other hand has stopped playing with her little pearl.

Your cock also gives new sensations as it starts prodding in between her lips now that her suit sits more loosely, and your hand caresses her ass as she just grinds down and does not rise from the feeling. You gently pat her ass, and she rises up again that little distance again. You pat her ass again, stopping her from descending again, and seeing as you raised your hips to follow her when she rose, you can let myself back down a bit. She sighs as your cock leaves her sex, but a quick twirl on her naked nipple shocks her into just staying still. Your fingers grope inside her bottom half now, stroking across her lips much more easily and before she knows it they pull the fabric the entire way aside to rest on her ass.

“W-wait,” she whispers, as you push her down with a hand on her chest and lift yourself back up. The head of your cock slips inside the tight lips of her pussy and she feels you push against her hole. You stop there though, and she just breathes into your neck from this sudden new sensation.

“Of course,” you whisper back, and you feel her tensed body unwind again and she sinks further into your lap and you back onto the floor of the pool. She rests there with my cock pressing at her opening, and you glance over to see Karianne staring with her own fingers dipped in her pussy, not moving. Penny moves back over to us again and slips into the water by my legs, before sneaking across them so she isn’t blocking Karianne’s view, and you get half a feeling she was trying to get a peek as well. Your daughters proximity sets a strange reality to it, and you feel uncertain of what you are doing.

“Is he doing it?” Penny whispers in wonderment
“Are you doing my dad?”

Nadia gasps, and Penny’s words seem to not make her comfortable. She rocks against the cock nestled between her lips, the big head pushing hard, but her tight opening won’t let you pass, and she shakes her head while still hiding her face away.

“It won’t go in,” she whispers.
“He’s too big.”

“Well try again, try harder.” Your daughter seems highly aroused and agitated by the idea, but Nadia just shakes her head again and shudders in your arms. She moves her sweet body away and sits back down with the cock trying to spear her. She clings to you for a soft moment, and when you feel it appropriate, you lift softly stroke her chin. She peers up at you and you lift her chin up to look at her face, and you both embrace in a soft kiss. She murmurs a soft kiss and slips off your lap and into the water again. Penny slips over and hugs her, and you see a somewhat disappointed look on Karianne’s face.
Nadia starts fumbling with her bathing suit again, and you realise she’s trying to get it back on. When Penny realises the same, she leans over and stops her hands.

“I…I have to go,” Nadia whispers.

“Bull,” Penny answers,
“There is nothing to be shy about. Please stay.”

Nadia seems to struggle with something, but penny just gently pulls her hands away, until they rest by her side instead. She strokes a hand across her back, and you see that she not only pulls the zipper back to where it was before Nadia pulled it up, she pulls it all the way down. The look in each other’s eyes as the zipper meets the end, and Penny starts sliding the suit over her shoulders. The suit slips down to reveal to you the side look of her small breasts. They seem rounder and bigger in her clear excitement, and when the suit is pulled all the way into the water, they stop. Penny smiles and with a quiet nudge, she turns Nadia towards you so you can see her as well. Her lightly freckled chest bears two small breasts you could easily fit in your hands, and she glows red here as well as in her face from her blushing.

“Just stay,” Penny urges.
“I’m sure you’d like him to touch you again, at least.”

Nadia just nods and you start to marvel at the sight before you. The little flower and your daughter sit there with both their chests on display. The smallest chest seems so sweet and innocent, and the large breasts of Penny taunt you once more for attention. Anne is now the one eagerly playing with herself while she licks and kiss Dawn who seems to be out of it with her own encroaching orgasm. Jessica works on her licking while you see her fingers grope between her puffy lips. They have been long above the water, but still glistened wet in your view as sounds of her fingers entering is heard along the moans of Dawn. Karianne rubs herself slowly with a disappointed glance between you and Nadia, but she also slips a hungry gaze into the water where your cock hides.