I am more swamped with work that I originally expected. Here is a short chapter to tide you over.
I finally manage to gather enough strength to stand up, uncorking my cock from Tina's ass with a lewd sound as I do so. Her freed asshole starts leaking my spunk, flowing along the asscrack and covering her cunt before dripping on the bed.
"All right, girls, this is fun, but we have to go pick grandma so let's hit the shower. Tina, honey, you need it more than most, so you go first with Rose. After you are done, it will be mine and Ella's turn. Oh, wait!".
I bend over Rose and gently remove the still vibrating ass plug from her insides.
"Hiiii. D-daddy… I wasn't expecting it!".
"That means that you already got used to this size somewhat and you don't feel it as not belonging, princess.", I say, smiling.
"Oh... yeah, maybe…".
Tina interrupts her sister with a light slap on her ass.
"Come on, Rosie, I really need a shower and I am not sure that I can walk that far alone. A little help, please?". In truth, Tina is so used to my cock that our earlier fuck would not affect her at all, but she is still playing her part for the girls' benefit.
"Ok Sis, let's go". Arm in arm, the two wobbling sisters walk to the bathroom. Finally, I have some alone time with Ella. My little girl is still lying face down on the bed, the vibrator still wreaking havoc inside her butthole. Her mouth is slightly open and drool is dribbling on the bed. Heh, guess she enjoyed it!
I find the remote for her ass plug and turn it off, then I sit next to her and caress her hair.
"Ella, baby, are you alright?", I ask, concern evident in my tone.
"Uh, wha…? D-daddy… y-yeah, I am… f-fine…".
"It's only you and me now, baby, so tell me honestly. How do you feel about the plug?".
"I… I don't know, daddy… It was incredible, but at the same time scary. I felt so hot, and so tingly, that I thought that I would explode.".
I smile at her, my hand never stopping stroking her head.
"That is how a good orgasm should feel, princess. There is nothing wrong with it. Tell me, do you feel any discomfort with the plug?".
"N-no, daddy. I mean… I did, in the beginning, but after a while, I was so flooded with new sensations that I totally forgot about it. Oh… It's still in, isn't it?", she asks, her brows cutely furrowing.
"Yes honey, it is still in. The girls will need at least fifteen minutes in the shower, so, since we are alone for now, you have a choice. I can remove the plug for you and we can cuddle, or I can turn it on again and lick your pussy until you cum. What would you prefer, sweetie?".