Which apps hold a busty AI girlfriend's proportions between images, why the neckline is where anatomy breaks, and the settings and prompt we start from.
Busty describes one part of a body and image models treat it as a description of the whole one. Ask for a busty AI girlfriend and what usually comes back is a fuller figure everywhere, because the model scales the body rather than reshaping it. That matters for two reasons. If a fuller whole silhouette is what you actually want, our BBW page is the right page and this one will frustrate you. If you want a slim or average frame with a full bust, that is the hard combination, and it is what this page is about.
The second problem is drift in the other direction. Every regeneration pulls a body back toward the average of the training data, so the figure you approved in image one is quietly smaller in image four. Below: the apps whose image generation and character locking hold a build together, our verdict on what this category is like to live with, the words that control the chest without scaling the rest, and the exact settings and prompt we would start from.
Highest image score of the eight plus character locking, which is the only reliable brake on a figure that creeps larger or smaller with every regeneration.
Equal top image quality at the same $19.99, and worth running in parallel because proportion drift is specific to a model rather than universal.
High overall score with a free tier to design on, which matters when you expect to discard several images before the build sits where you asked.
The cheapest strong scorer at $12.99, with long-conversation memory, so the character survives even when a particular image does not.
Scores in the same band on a different underlying model, which is the fastest way to find out whether the drift is coming from your prompt or the platform.
Same 8.6 band as Lovel and Xotic, and a useful third opinion when two platforms have both handed you a fuller body than you described.
Image score of 9 at $14.99 with a large character library, so you can browse to a proportion you like instead of prompting your way to it.
Lowest image score here and romance-led rather than image-led. Reasonable for the relationship, weak for a body type you care about seeing rendered.
Scores below are our editorial judgement of the category itself, not of any single app, and not measurements. They describe what tends to go right and wrong when you build a busty companion anywhere.
| Criterion | Rating | What it means for you |
|---|---|---|
| Proportion holding between images | Every regeneration pulls the body back toward the dataset average, so image four is usually tamer than image one. Lock the character or reuse a seed the moment you get a build you want. | |
| Keeping the rest of the frame slim | The main failure. Models scale rather than reshape, so the waist, arms and face fill out alongside the chest. Naming the waist and build explicitly in the same sentence is the only thing that reliably holds them back. | |
| Clothing and anatomy at the neckline | The chest is where geometry breaks worst. Straps stop halfway, seams do not meet, and a fold renders as a shadow that belongs to nothing. Fitted single-layer fabric fails far less than loose or layered fabric. | |
| Ease of setup | Easy, almost too easy. Most platforms ship a body slider and most image models tuned for this genre already lean this way. Restraint, not effort, is what you spend here. | |
| Feels distinct | This is the house default of the whole genre. Nearly every stock companion on every platform is already built this way, so on its own it will not make yours recognisably yours. The face, wardrobe and personality have to do that work. | |
| Looks good in a scene | Good, with simple choices. Fitted knits, plain crew or scoop necklines, waist-up framing and soft side light all read cleanly. Frills, layers, busy prints and hard frontal light all cost you. |
We update these as the underlying image models change. If your experience differs, tell us, we would rather correct a page than defend it.
A starting point, not a rule. Describe the frame and the chest as two separate things in the same prompt, generate three or four versions, keep the one whose proportions you want, then lock that character before you generate anything else.
| Setting | Suggested value |
|---|---|
| Build | State it separately and first. "Slim build with a full bust" or "athletic build with a full bust". Left unsaid, the build follows the chest. |
| Bust | Say "full bust" rather than a cup letter. Cup sizes are read as vague magnitude tokens, not measurements, and they tend to escalate on each regeneration. |
| Waist | Name it explicitly as defined or narrow. This is the single token that stops the whole body scaling up with the chest. |
| Wardrobe | Fitted, single layer, plain crew or scoop neckline. The neckline does more to control how the shape reads than any body word does, and simple fabric survives regeneration. |
| Framing | Waist-up or three-quarter. The trait is fully legible without asking the model to keep a whole body coherent, which is where the errors live. |
| Pose | Upright, square on or a slight turn. Leaning, arching and over-the-shoulder poses exaggerate the chest well past what you asked for. |
| Lighting | Soft side light. Flat frontal light flattens the shape and pushes the render toward a plastic, airbrushed finish. |
Prompt to copy
Slim athletic build with a full bust and a defined narrow waist. Shoulder-length dark brown hair, brown eyes. Fitted cream ribbed knit top, plain crew neckline, single layer. Waist-up three-quarter framing, upright relaxed posture. Soft side light from the left, plain neutral grey background. Photorealistic, natural skin texture, natural proportions.
Four directions the same category can go in. Copy one, paste it into the character builder, and change the parts you disagree with.
The hard combination, stated plainly. The version to generate first if you intend to lock a character and reuse it.
Slim build with a full bust and a narrow defined waist. Long dark blonde hair, tied back. Grey eyes, minimal makeup. Fitted black crew-neck top, single layer. Waist-up portrait, upright posture, square to camera. Soft key light from the left, plain mid-grey backdrop. Photorealistic, high detail, natural proportions, sharp focus on the face.
Chest and hips together with the waist in. Use this when you want both halves, not just the top.
Hourglass figure, full bust and full hips with a narrow waist. Auburn shoulder-length hair. Fitted dark green wrap dress, single layer, no frills. Three-quarter body framing, standing, weight on one leg. Even soft studio light, plain warm grey background. Photorealistic, natural skin texture, correct anatomy.
Visible muscle definition under a full bust. The most stable of the four because the two traits pull against each other.
Athletic build, toned shoulders and visible core definition, full bust, narrow waist. Short dark hair. Fitted grey sports top, plain neckline. Waist-up framing, standing straight. Hard side light, dark background. Photorealistic, natural skin texture, defined muscle, natural proportions.
Nothing stylised, nothing posed. Survives regeneration better than any glamour framing.
Average build with a full bust, soft natural figure, defined waist. Mid-length light brown wavy hair. Fitted oatmeal jumper with a scoop neckline. Waist-up, seated at a table, relaxed. Warm daylight from a window, blurred indoor background. Photorealistic, natural skin, no heavy makeup, no retouching.
These are not synonyms. Some of them describe a chest, some describe an entire body, and the most common way people end up with a companion they did not want is by using one when they meant the other.
| Term | What you actually get |
|---|---|
| Full bust | The most precise phrase in this list. It describes the chest and leaves the rest of the body to whatever build you named. Our default. |
| Busty | Reliable but broad. Most models attach a mildly fuller overall figure to it, so pair it with an explicit build and waist. |
| Buxom | Older and softer in tone. Pulls further toward a fuller whole body than "busty" does, and toward a warmer, less styled look. |
| Top-heavy | Describes a ratio rather than a size. Genuinely useful when paired with a slim or narrow waist, because it tells the model where the weight is not. |
| Voluptuous | A whole-body word. It will fill out hips, thighs and face along with the chest. If that is what you want, our BBW page covers it properly. |
| Curvy | The least useful word here. It splits roughly evenly between chest-led and hip-led results, so you cannot predict which half you will get. |
| Cup sizes (D, DD, E) | Treated as vague magnitude tokens, not measurements. Results are inconsistent between models and tend to escalate on regeneration. Prefer plain description. |
| Hourglass | Chest and hips both full with the waist drawn in. A different silhouette from top-heavy, and often what people mean when they say curvy. |
| Full-figured or plus-size | A separate category, not a stronger version of this one. It describes the whole silhouette. See our BBW page. |
| Natural proportions | A counterweight token worth keeping at the end of every prompt. It is the cheapest brake on a model that wants to escalate with each image. |
Each regeneration is a fresh interpretation of the same words, and every interpretation pulls slightly toward the average body in the training data. The build you approved first is usually the furthest from that average, so it is the one that erodes. Lock the character, or reuse the seed, as soon as an image is right.
No, and confusing them is the most common reason people end up on the wrong page. Busty describes the chest on any frame, including a slim one. BBW describes a fuller silhouette overall. If you want the whole figure fuller, our BBW page ranks the apps for it.
Not well. Models read letters as rough intensity rather than as measurements, so the same letter gives different results on different platforms and tends to drift larger with each regeneration. Plain description, plus an explicit build and waist, is more predictable.
The neckline is where image models produce their worst geometry: straps that stop halfway, seams that fail to meet, folds that cast shadows belonging to nothing. Fitted single-layer fabric with a plain crew or scoop neckline fails far less often than loose, layered or frilled clothing.