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From the FTF wiki:

[Novel] Starship Titanic by Douglas Adams and Terry Jones. One of the novel's characters get caught in a tiny black hole and ages a few thousand years (!). When put in a rejuvenation chamber to heal, she ends up with, among other changes, firmer, bigger breasts.

The first 79 pages of the novel can be read here, which is enough to experience the IB. The character, named Nettie, enters the rejuvenation chamber in chapter 16 and is revealed, better than ever, in chapter 19.

Excerpt from chapter 16:

While Dan had gone to talk to the bomb, the prematurely aged Nettie had taken
the opportunity to look around the room in which she found herself. At first she
thought it must be some sort of torture chamber or at least an interrogation
room. But, once she'd put on her translatorspecs, she realized she was in the
ship's Hairdressing Salon and Beauty Parlour. The thumb-screws were actually
elaborate nail-clippers, the electric chairs were highly ergonomic sitting
structures, and the individual gas chambers were hairdriers. It was obvious once
you read the motto over the doorway:
'WELCOME TO THE STARSHIP TITANIC BEAUTY THERAPY AND HAIR CREATIONRY. YOU WILL
LEAVE HERE LOVELIER AND YOUNGER.'
Nettie put out a wizened finger and pressed the button on the wall beside the
couch, which was marked:
'Press for service'. A metal cage on an articulated arm suddenly sprang up over
the back of the couch and dangled a few inches in front of her face. At the same
time a large glass case began to descend from the ceiling until both she and the
couch were encompassed by it. A reassuring voice then said:
'We have assessed your beauty requirements and, whilst recognizing you have a
severe problem, we would like to reassure you that there is nothing that you can
wish to be done that we cannot accomplish, thanks to the de-aging and
rebeautifying techniques pioneered by Dr Leovinus in this machine. Lie back and
relax whilst we return you to the bloom of youth. Normally our therapy would
require just a few minutes, but in critical cases such as yours a little longer
may be necessary. We apologize for the delay.'
The next moment, the cage fixed itself over her face and the glass case filled
instantly with some purple gas. Nettie was terrified for a second, but then
relaxed as the perfumes began to enter her nostrils: erotic perfumes, exotic
perfumes - scents she had never imagined, scents of far away and wonder... at
the same time the feeling on her face was inexpressibly soft and kindly. She lay
back and just hoped that Dan had managed to talk to the bomb.

Excerpt from chapter 19:

But before he could wreak his terrible and destructive revenge on the
perpetrators of this slipshod botch-work a miracle happened.
The door of the Crew Room opened and a vision entered - someone so compellingly
and so unutterably beautiful that Bolfass fell heavily and permanently in love.
His life was never to be the same from that moment forth.
He lowered the SD gun and stared in childlike adoration.
Nettie, who had just completed her course of rejuvenation in Leovinus's
extraordinary beauty parlour, had not only regained her youthful complexion, her
body also had returned to its former proportions. In fact, if anything, her
waist was just that little bit thinner, her breasts just a tiny bit firmer, the
swell of her stomach just a tad more rounded. She looked more lovely than ever
for, despite the fresh bloom of youth that had returned to her cheeks, her face
was also suffused with the wisdom that comes of having lived for several million
years. Old Leovinus certainly knew what he was doing.
'Nettie!' murmured Dan.
'Who d'you say?' asked Bolfass absent-mindedly.
'Hi! Everybody!' said Nettie. 'Supposing we all introduce ourselves? I'm
Nettie.'
'Captain Bolfass at your service!' said Bolfass, springing to attention 'And
these are Corporals: Yarktak, Edembop, Ragtiliten, Desembo, Luntparger, Forzab,
Kakit, Zimwiddy, Duterprat, Kazitinker-Rigipitil, Purzenhakkken, Roofcleetop,
Spanglowiddin, Buke-Hammadorf, Bunzlywotter, Brudelhampon, Harzimwodl,
Unctimpoter, Golholiwol, Dinseynewt, Tidoloft, Cossimiwip, Onecrocodil,
Erldehammerdrat, Inchbewigglit, Sarniliftodft, Buke-Willinujit (he's a
halfcousin by marriage of Buke-Hammadorf)...'
'Hi, Nettie!' said one of theYassaccan invaders.
'Barnzipewt,' continued Bolfass, 'Spighalliwiller, Memsiportim, Itkip,
Harlorfreytor, Pullijit, Beakelmemsdork, Uppelsaftat, Bukhumster,
Rintineagelbun, Bootintuk, Poodalasvan, Sumpcreetorkattelburt...'
'Look! I hate to interrupt,' interrupted The Journalist, 'but there's a bomb on
board this ship which is about to go off in...' He switched on the mobile phone.
'Ten... nine ..' counted the bomb.
'Hot shit!' exclaimed The Journalist.
'Silence! Blerontinian Purveyor of Shoddy Goods!' shouted Bolfass, grabbing the
mobile phone.
'He's not a Purveyor of Shoddy Goods!' exclaimed Lucy (who, if the truth were
told, was a bit hacked off by the reaction to Nettie's entrance).