Does she ever!

She gives you a brief tour. She shows you where the bras and panties are kept in the dresser and where the swimwear is hanging in the closet. Then the nightwear which she expects you to use. Then the rest of your clothes; most of them either obviously revealing, small or outright lewd.
"And plenty for when we get really big!"
"Wait, you didn't know then..."
"No, but I hoped so! I couldn't help myself, it was so hot to buy for that possibility! I ended up being right! Tonight we don't need any of them, however," Amy concludes her tour. "Our first night in this bed will see too much cum flying around...I don't want to stain them...at least not all of them...not yet."
"Oh, you sound like this is some kind of honeymoon, like we are married," you say as she lewdly lays on the bed and beckons you to lay beside her. You take her invitation and climb onto the bed beside your like-minded and like-formed companion.
"We don't need to be married, but after today, how can you deny that we are soulmates? Our sexual cravings are both **** and bizarre. We enjoy each other's company, and feel comfortable enough to admit what we really want...I like my cock and you like to play with it. See-ee!?"
You had been jerking her cock the entire time and it just erupted, spewing her juices as ropes flying randomly with her jerking member. You are surprised you were doing that.
"I guess that settles that," you resign.
You crawl up onto her chest, right above her belly. Her bosoms, heaving from her orgasm, surround your cock as you close your legs along her torso, pushing them together.
"Let the cum fly," Amy agrees, as she puts her hands on your tits.
You move your hips to slide your dick between her cleavage. When was the last time you got off? You don't remember, but you think it has been a while as your cum starts surging up from your balls, mere moments from erupting. You hop up and quickly stand above her with your hand working your meat.
"Getting into the spirit of the occasion?" Amy asks as she stretches out below you, like some huge pregnant cat.
You spray your cum everywhere, not aiming at any spot in particular. You notice after a few squirts that you are cumming more than normal; you are still shooting full ropes that are splashing down around you.
"That was more than me," Amy tells you after you finish and she whistles appreciatively.
You sink down to sit and end up on her thighs. You back down a bit further, then lean down and wrap your boobs around her cock, still slimy from her last cum.
"Yes! We are gonna make a huge cummy mess! Rub it in, or leave it where it lands?"
"Leave it, it will be interesting to see how it all ends up," you tell her as you furiously shake your tits so they stimulate the cock between. You feel liquid shooting between them and hurriedly free it so it spews all over. The first shot lands on your face before you can sit up from your bent-over position. You still hang your tits near her cock, hoping to catch a few ropes on them, and you do. The rest end up on her and the bed.
"Your turn," she tells you.
"I am hard again, this isn't normal. Probably something to do with these?" You caress your middle.
"Probably," Amy agrees as she sits up and grabs your cock to jerk it off. "I find it quite useful," she says as she vigorously jerks you off.
Her enthused effort has her arm knocking into her breast, shaking it in time with her motions. For your part, you just sit there and let her work you. When she looks up at you, you give her a big smile. She smiles back. You could hold back at this point, but you won't today. You let yourself be brought to orgasm and blast your cum. The first lands on her arm. The second you try to build some pressure and manage to land it in Amy's hair. Again, and the next lands mostly in your open mouth. The fourth lands across your chest. The next two splash against your belly, and then the next lands on Amy's cock. The rest land on Amy's hand and drip onto your legs.
"You got some good distance there," she says, looking up.
"You just try to hold it in, and it builds pressure."
"Oh, I'm new to the whole penis thing, remember? Let me practice this."
She pulls her legs out from under you.
"That's some good lube there," you tell her after swallowing.
"We don't need it," she tells you as she guides your head to her crotch. "How do you feel about eating your own cum?"
"I can if I have to. You?"
"I really like mine. It's kinky."
"Yeah, I guess it is," you finish as you put your mouth over her cock. You taste your cum on her. Not bad, but hers is just more tasty.
Slurp, slurp, slurp. You suck her with the intention of a quick orgasm. You both seem to be able to cum in rather quick succession, by your old standards.   She starts to breathe heavier, and after the first shot of cum in your mouth, you pull the spewing penis from your mouth. It shoots rope after rope on your face. Amy isn't trying to aim it elsewhere like you thought she might. She looks to be concentrating. When her cum stops, she looks down.
"Cum facial? Looks good! Gotta do that more often!"
"Cool, I like wearing your cum on my face, I can lick it up for a snack later."
"Kinky. But you can always just suck me off for a snack."
"Sure, sure. You're right."
"Course I am!"
"So we did tittyfucks, blowjobs, handjobs..."
"I didn't suck you off yet," Amy reminds you before she has you stand, then bends over to put your dick in her mouth.
You put your hands on her head and guide her movements. She makes lots of noise, and that just makes it even better. She grabs you by the ass and pulls you into her as you pull her head  to you. She makes a 'mrhf' sound each time. You are colliding with her face rather hard. You quicken the pace and she just makes one long low whining moan...until you cum and it changes to a gurgle. She looks up as you cum, her face red and eyes watering. Her mouth is hanging open. Each time she gurgles, a rope of cum oozes out onto the bed. You are probably lodged in her throat. She makes no move to pull away until your dick stops spasming. When she does she takes a big gulp of air, pulls herself upright, takes her cock in her hand, and after a few quick jerks, blasts ropes of cum up between the both of you. Every one of them lands across your chest or on your face or in your hair.
"Yes," she gasps. She presses her belly against yours.
"That was?"
"Something I had to try," she tells you as she sinks to the bed, her hands running down your body for support.
She sits there, catching her breath. Then she lays back, her legs in the air. You look at her huge grin. You step to over her legs. Her feet trail between your legs and back. She digs between your cheeks with her feet. Once she finds the way inside of you, she pushes her feet into you.
You let gravity do the rest. You sink down her toned legs faster than the first time. Within minutes your cocks meet, and she takes both of them and presses them together to masturbate herself.
"Want to go farther yet? I would love to see you get past my hips."
"No way, you are lucky I'm even doing this again!"
"Don't have a cow! Thought you might be feeling adventurous."
"This is adventurous! Hello, I let you stick your legs so far up my butt you are jerking us both off together! That's a little kinky," you tell her, exasperated. "What are you doing?"
"Opening my legs," she says matter-of-factly.
"You are stretching meee..."
"Really? Weird. I just wanted my balls to hang down properly."
She manages to spread her legs a few inches. Once her balls fall between them, you cum. Your ass clenches, pulling her legs back together.
"Noo, you are going to squash my balls!"
She forces her legs open with **** determination. Thighs of that size are no match for an asshole stretched beyond natural limits. She forces about a foot between her legs in a very short time. You just don't have the muscle density. You slide down her legs farther to the base of her hips to avoid that. You are pushed up against her cheeks with your own. You see her pussy dripping into your ass pushed up against her. Both sets of balls press together.
"Let me go."
"You avoided me stretching you out? That's not nice," she pouts.
"I'm still sore from your earlier stretching! My butt isn't a rubber band! I'm going to be gaping even more now!"
"More!? You were gaping before? Like..."
"Yes, my ass wouldn't close. It stayed open a good fist size. You didn't notice when you slid your feet in?"
"No," Amy says sheepishly. "That's not a bad thing though!"
"Well, it could dry out inside, that's not good!"
"I'll keep you wet, I promise!"
"That's not all. It isn't good because..."
"...Because why?" Amy waits for your answer.
"I can't think of anything else."
"Well, you don't smell."
"I didn't think about that. I haven't had to use the bathroom since then," you say, referring to your first encounter in Amy's apartment.
"Me either. Maybe it is using that material. It would be the least surprising thing that has happened to me since then."
"So then, I guess there's nothing wrong with me gaping, if you will make sure I don't dry out."
"I will make sure to either have your butt worked or wet at all times," Amy pledges. "Gaping just happens when you stretch more than you grow, right?"
"I don't know...maybe?"
"Let's see if we can make you gape wider then. Let's get you to the bottom of my belly, butt included. Not like I'm anywhere near as big as you back there. So let's do it before I get to be!"
"So I'm supposed to fit your entire lower half into my butt? I'm still sore..."
"Yup! What's a little soreness in the face of experimentation?" Amy huffs.
"You got me, I'm curious too. How am I going to get the leverage to push you into me?"
"Uh, let's see..." Amy ponders. "Well, let's prop me up by the headboard. Then you just sink down, and I'll do my best to stuff my butt into you with my arms. If my belly rests against the board, my tits should keep me balanced leaning against it."
"Isn't that going to be uncomfortable?"
"It will be for you too. This is the best way I can think of to make it easier on you." Amy scoots back until her head is on her pillow, taking you with her, then she arches her back and lifts. "Don't ogle my thrust-out tits! Use your legs and pull me upright!"
You pull yourself up and then over Amy. Her front is squashed against the headboard. If that was a human baby you would be concerned by the pressure on her distended belly; a demon not so much.
"You OK down there?" You want to make sure she can breathe.
"I can breathe, if that's what you are asking," the muffled response comes.
"Yeah, it was. So what do I do now?"
"Well, I use my arms like this..." Amy's muffled voice says. She raises her hands to her own butt wheee it meets yours, and starts compressing it as best as she can. "Then you push or let gravity pull you down or both until you get some in, then we keep going like that. I need you to pull really hard in front before we start."
"Why...oh! I get to have the 'source of your lust' in me first? Definitely will help you with that," you say more lustily than you intended.
"What? Did your voice just change?"
"No...crap. There once was a man from Nantucket...yes, it did. I sound like a sex-starved housewife."
"Haha, that's awesome! You probably drank too much of my cum. It is quite potent, I always said."
"You never said that! And you haven't even been able to cum this much until today!"
"Still, you should have seen it coming. You haven't shaved since our encounter, yet your face is smooth. Your tits, belly and ass are hairless. Your arm hair is thinning out to mere wisps. Your face is even changing. Face it, you are going to be a girl with a dick like me!"
"Hrm, that's not good." Then in a moment's time, you think it's great! Why is that? "Actually it is! I wouldn't need people recognizing me. And a pregnant man...that isn't hot, is it?"
"To me it is, but this way is equally as hot because I know it's you. And you sound flat-out sexy."
"Thanks," you say gratefully.
You push your hands between your legs and grab the edges of your distended asshole and pull up with all your might. You moan a bit at the pain of the sudden stretch, but manage to pull it over her balls. It pulls them down and into you.
"Good job! Now let's get to work."
You lift your legs onto the headboard one at a time. You are now at the maximum you can spread and thrust out your ass, while having the greatest **** put at where her butt is planned to enter you.
"Do you want me to help you there?"
"My butt is like half the size of yours. I think I'll manage, honeybuns. You have gotten a few inches in already."
"OK, here we go."
You grab the headboard with both hands and start bouncing. Not just jiggling yourself, but raising and lowering yourself with great long...bounces? Slow, deliberate, forceful are good descriptions. You feel her cheeks entering you. Amy is huffing beneath you with the effort. You are breathing heavily yourself. Your bosoms are heaving, and bouncing around too. You thrust your chest out too, and watch them jump around wildly. Simply mesmerizing. It's nice having something soft like another butt up yours.
"Wait," you say, "did you say something?"
"Yeah, I said 'good job'."
"I wasn't paying attention. Say again?"
"Your ass basically ate up my own. I pushed the hump of my cheeks flatter, and down you went. The front needs a hand, though."
"Oh? Oh. I'll handle your cock."
You take the hard member and give it a few hard jerks and she squirts. It falls over her belly to the underside of her tits and into her hair. You tuck the softening cock into your butt, and slide to the bottom of her belly.
"Next challenge is this," you pat her middle.
"R-really?" Amy stutters.
"How else can I prove I'm the breast?"
"The breast? Freudian slip?"
"No, you're a boob. I'm the breast."
"Don't test me. I already have my foot up your ass!"
"Haha, right, what can you do now?"