They wake up happy!

You shrug. At least yours is manageable.
"I wish you were real, Red," you tell her, then put her little dick between your lips and suck. Before you realize, the dick expands to stretch your mouth wide, and elongates to your throat then down it. You had the common sense to take a very deep breath before this happened.
"Oh, master! That's mean. You should be lucky her cock was not fully grown, or Amy would have been injured!"
You see Amy's mouth stretched obscenely by the larger cock, the huge thing visible down her neck. You work Red's cock a bit before you run out of breath and pull off. Amy had already pulled off after her initial surprise, and is coughing.
"What a way to meet my master!" Blue looks down at her adoringly. She sits beside Amy. "I'm called Blue, apparently."
"I'm Red. It's a pleasure to meet you. But excuse me while I spank my master for playing that trick on you." She sits beside you, and you lay over her lap. She leans down to whisper in your ear. "Master, you are so naughty!" Smack. "I know Blue is entranced by her after meeting that way." Smack. "I'm going to spank you 'till you are pink...er," she finishes with a giggle. "Oh, and then we will talk blowjobs, I can't believe you took it all in!"
"Blue, your nipples are longer than I remember," you interrupt.
"That is the blue-skinned sign of arousal, Amy. That means I find you...alluring," Blue tells her.
"Oh, flattery will get you everywhere," Amy giggles as she fondles Blue's nipples.
"Finished your spanking, master," Red announces.
You stand, and the lay the other way, with your face in Red's lap and your ass on Amy's.
"Look at that, just what I wanted, something to fist," Amy says as she rubs your freshly-spanked cheeks. Her hands spread your cheeks.
"Blue, you first, he needs four fists now, since he's so flexible," Amy compliments.
"As you wish, mistriss," Blue says as she clenches her hands into fists and pushes them into you.
"Can you really take four, master?" Red looks down at you playing with her balls.
"Sure can! Probably six, if you want to get in on the action, Red," you say before sucking her cock into your mouth.
"Come on Red, I'll keep him spread." Amy chuckles.
"I'll be happy to join in the fun."
You pull her cock out, and she straddles your back.
"Your balls?" Blue nods at them since she can't point.
"Master wanted them external, I think he likes to see where the cum comes from," she says sweetly. "It's like going to a candy factory."
"Where are your balls, Blue?" Amy demands.
"Ah, they are quite large, Mistriss. Full watermelon sized, each."
"Well let's see them swinging between your legs, like the rest of us!"
"Of course, my mistake," Blue confirms. In a similar fashion to Red, balls grow from her crotch. These don't stop at mere cantelope size, but grow until her breasts rest on them as her balls fill her lap.
"Keep your eyes in your head, master!" Red catches you staring. "You should be staring at my butt, all pressed against you, doesn't it look nice?"
"Well sure," you admit.
"Now behave," she tells you as she presses her hands into your butt.
"Don't you feel more comfortable, Blue?" Amy asks as she ogles the large orbs.
"Yes, Mistress. Much better. So let's pull him in four directions."
The demons pull your asshole open a little more, and Amy takes the opportunity to wedge her hands between the others.
"Prying me open isn't going to work, silly girls-with-cocks. You need to pull and push, too," you tell them, unable to see over or around Red's bubble butt.
"Fist fucking isn't good without the second part," Amy chastens. The demonesses start pumping their fists into and out of you. Amy begins wedging her hands in farther, loosening you further.
"I can feel my ass getting looser, keep going," you encourage them.
"Almost in," Amy tells you after a short while.
"Whew, my butt is tired," you yawn. "You are giving it quite the workout!"
"I don't mind fucking a sleeping butt," Amy retorts.
"I didn't say you should, Amy," you smile.
"Ah, I'm in! Look at that sight!"
"Imagine when it's cocks," Red mentions.
"Can't wait to have a nice thick one myself," Amy dreams aloud.
"It won't be too long," Red assures her.
"How long does this usually take?" You question.
"A month," Blue answers.
"That's it," Amy states. "This is officially awesome!"
"You are both progressing well. Amy's cock has grown considerably even in the past couple hours I have been here. It has doubled in size."
"My titties too," you say as you feel your chest. I want to use Amy's bikini top, so I jiggle."
"That's fine. Just keep the thong too; I prefer butt cheeks jiggling," Amy laughs.
"I want to see both, master," Red tells you.
"I'm glad Red." You flex your ass around her hands.
"Perhaps we can have some alone time," Red suggests to you. She runs her tail around into your mouth. She has made a pool of precum on your lower back.