A good while later...

You wake up at the same time as Amy, it seems.
"The food you were cooking...!" You panic once you remember where you are.
"It was off once I started cumming in it, didn't want it to boil off! Wanted you to get the full flavor. How long were we sleeping?"
"Looks like over twelve hours."
"These seem bigger," she says as she squeezes your breasts. "They look like they could pop out!"
"This too," you say as you squeeze her cock.
She gets up at that and takes a look. It's about your size now, with balls a little larger than yours.
"This is a real cock! Let's use it!"
"What do you want to do?"
"Uhm. Ah...we could do that, or that..." She absently rubs her cock. "Oh! It's making precum!"
You get up from the floor and after dusting yourself off, sit back in the chair. Your butt has grown large enough to spill over the sides. Looking down, you can see your areolas sticking out from the top of your bra. Definitely outgrew this one. Your nipples look to be a good three inches now tenting your bra. They are probably the only thing keeping your boobs in the bra.
"I know now. Time to fuck those tits!" Amy hops up to sit on the table in front of you. "Whip em out!"
"Isn't that your blowjob position?"
"No when I lean back like this," she leans back on her elbows, "I need your tits wrapped around my cock, not your mouth."
"My mistake," you admit as you pull down your bra in the front; it wanted to do that anyways.
"They look as big as mine!"
"Jealous?" you ask as you lean over her crotch.
"No! Happy! Excited!"
"I can see that, your cock is glistening with your precum." You wrap your breasts around her penis. "How's that?"
"So nice!" She puts her hands on your shoulders and starts fucking your chest. Her belly is right in front of your face. It sure has grown. You look up at her. Amy is smiling down at you. "Let's see how much ammo I have now!"
Amy stops thrusting at you and just slides it between your tits. She cums. Rope after rope coats your cleavage. A nice normal quantity, maybe a little more. "Let's see it!"
She allows you to pull away. You spread your boobs. You are completely wet, and several gobs of cum still stick there. "That's a good amount."
"Yes! A real live cock! I love it! I was going to tell you to rub it all over your tits...but I guess I didn't need to. We are so on the same page!"
You make sure to squeeze your boobs plenty as you rub her cum around. "Wonder when my milk will start."
"Think I'm still gonna have you outgunned!" She aims her cock at you.
"Hard again, huh?"
"Yes! Let's go back to the living room."
"Clothes optional, right?" you ask as you peel them off.
"Of course! You sure are filling out," she whistles as she snaps off her bikini top and bottoms.
"Your belly is filling out," you laugh as you slap it. "You look ready to give birth, if that was a human baby."
"Stop," she slaps your hands. "My girth only adds to my charm. You may be half my size, but it's still big too." She pokes your belly.
"Yes, it's part of my sex appeal, shows how fertile I am."
"That's what the rack is for," she tells you as she cups your breasts.
You swing your belly to the side of Amy's and move closer and grab a hold of her boobs too. You pull hers out as you press your chest forward. You slowly press your breasts against hers. Her breath catches. She helps hold them in place as she gyrates her chest, getting her cum from your breasts onto hers.
"This feels good," she tells you, her voice thick with lust, "very good."
She pushes you back onto the couch, lifts one of your legs onto her shoulder, and plunges her hot cock into your ass. She isn't much really, but it's nice to have something up there. And she is so excited! You just smile up at her as she goes at it.
"At least you aren't so stretched out you are gaping. I know I'm not that big, but at least you are are good for me!"
"Doesn't mean I don't appreciate the effort!"
She then climbs on top of you, or tries to at least. The bellies get in the way. She then gives up and just pushes hard. You aren't surprised when you feel cum splashing inside of you. After she finishes, she withdraws and sits beside you.
"Done?"
"Just need a break," she tells you, out of breath. "Those nipples sure are big!" She plays with the one on her side.
"Sure are," you agree as you look down. "You sure are dexterous for your size. What's up with that?"
"I feel the weight, but I don't mind it and it doesn't slow me down. Don't ask me why!"
"I feel the same about mine. It's there with the weight and all, but the only thing I'm aware of is the size."
"Only one size I care about," Amy begins. You immediately hop up and strike a sexy pose facing away from her, slowly gyrating your hips. "Your butt size! Haha! You knew! They are nice looking, wow! Can you always move like that?"
"I guess, why?"
"Well...it makes my dick rock hard!"
"No problem then!" You hop back to kneel on the couch beside her. "Bet you want to try from behind..." You wiggle your ass at her.
"Sure!" You bend over on all fours watching her face the whole time. She makes sure to rest her belly on your back first. She presses into you slowly this time. "Mmmm, it's like your big bubble butt is hugging my crotch!"
"Yeah," you say as you sink to lay on your breasts.
"This is a good angle. I like feeling your body against my ass," you tell Amy.
"Yours is so big! Mine is big but not like that!"
"You get a cock and balls. That's not a bad trade."
"And your tits are outgrowing mine! Makes me so mad I want to take it out on someone with my cock! Oh look...here you are!"
She punctuates her exclamation with penetration. Without waiting or warning, she grabs your hips and pulls you back into her oncoming forward motion...repeatedly. Once her pace is set, Amy slowly releases her grip to make sure you keep meeting her thrusts without her guidance. Then she starts slapping your butt cheeks anywhere she can reach. Each time her hand comes down, she runs her hand over your skin after. It may be due to its size but you enjoy the mistreatment. When it becomes clear she is about to cum, you sigh in disappointment. You feel her load shoot into you, then stop soon after.
"I have to show you who is boss here, in case those curves make you forget, hehe."
"I had it coming," you feign.
"Look at you...all covered in my cum. When was the last time you showered?"
"Ah..." you begin.