Only the breast implants

"Give me the breast implants," ordered Samus. While she wasn't necessarily lacking up top, she wouldn't mind a boost, and it definitely seemed one of the most practical of the implant options.

The AI replied, "As you wish. I would recommend that you mentally prepare yourself, as this might feel a little overwhelming at first." The console beeped as a receptacle opened. Inside was a small, unremarkable chip. "Please slot the upgrade chip into your recently added upgrade port, and it will do the rest of the work."

Samus tentatively grabbed the chip, holding it up to her eyes to get a close look. Nothing about it suggested anything special, especially not that it hid such advanced technology as the AI purported.

Samus closed her eyes, breathed deeply, and steadied herself. Her heart beat in anticipation, as she wasn't quite sure what to expect. "Here goes nothing," she quietly uttered, slotting the chip into her suit.

Her suit made a confirming beep! as she suddenly felt two sharp pricks on the lower back ends of both her boobs. Samus grunted from the minor pain, and suddenly she felt something akin to liquid, or maybe gel, flowing into her tits. She gasped as her breasts slowly billowed outwards, as if they were being inflated by balloons. She ached to grab and massage them, but she feared she might cause an issue if she did so. Instead she braced herself against the console as she shifted her legs and stifled a moan. It felt surprisingly good to have her tits expand. The AI hadn't been kidding about that.

Samus's boobs nearly doubled in size before they stopped. Then, to her surprise, her Zero Suit began splitting from the front of her neck down, as if a nonexistent zipper was being pulled. It stopped just below her breasts, leaving in view copious cleavage.

And copious cleavage she did have. Samus looked down at her body. Her tits were now several measures larger, and perfectly round. It was if she had two cantaloupes strapped to her chest. She reached and gave one boob an experimental squeeze. While they were impossibly round and perky, they still maintained the pliability of natural flesh. Her body tensed as small waves of pleasure shot through it. Her sensitivity had definitely increased, but thankfully it was manageable.

The AI suddenly spoke up. "How are you feeling, Miss Aran?"

Samus stammered out a reply, still taken aback by what had just happened. "O-okay, I think. I just need some time to get used to this. Why did my suit change, as well?"

"You must be referring to its physical alteration. As your new implants are designed to expand in size, potentially to infinite capacity, it would be inefficient to also increase the suit's fabric in turn. Instead, this opening will give your breasts the freedom to grow as large as necessary, without needing to add more material to the suit. You will still have the same amount of protection, as your suit will use the implants' energy to create an invisible barrier around you. If you are not one for public exposure, be wary that your breasts will be completely exposed if they grow large enough."

The AI almost sounded proud of itself. It sure did think through all the possibilities. An eternity of research and design allowed for such thorough planning, Samus surmised.

"Now, Samus, please head to the examination chamber. I need to make sure all is well with you, and you will have a chance to examine your body as you please."

A door to her side opened up, and markings on the floor lit up to guide her the right way. Samus took a moment to settle down and think. It was probably a good idea to get herself checked out before doing anything else. Or she could disregard the AI's suggestion and do something else.