The Greentexts

By this point, Bahamut's hips are bigger than even those of his domineering sister.
His noble voice now effeminate and needy.
His once-mighty muscles lost under a layer of softness from his nightly fillings.
In contrast, his cock and balls have only grown, for the amusement of his mad sister. Impossible to hide, undeniable evidence of his new lot in life as Tiamat's plaything.
This even extends to Bahamut's Clerics. Many did not abandon their god, out of faith in him to return, or disbelief in his situation.
Slowly though, the changes affecting him spread to his Clerics. Their bodies changed as his had, their minds likewise becoming submissive to the domineering clerics of Tiamat who often claimed them.
Before long, Bahamut's temples are more akin to brothels, run by Tiamat's own faithful.
Some men and women turn to worshiping the new Bahamut to improve their endowments, planning to stop once they've reached their preferred size... but once the physical changes have started, the mental ones are firmly rooted, and most find it impossible to stop paying homage to their broken god, soon joining his 'temples'.
Even more extreme are the tales of those who court Bahamut's attention directly, in as much as it can be diverted from his insatiable sister...
The Metallic Dragons were hit the hardest by Bahamut's fall into depravity. Intrinsically linked to their fallen god, their bodies likewise follow his, softening, swelling, weakening... Twisting physically and mentally into sexual playthings for their Chromatic kin, whose own lusts have been amplified by the change in their insatiable queen.
It is now uncommon to find a chromatic dragon without at least one metallic concubine, often visibly filled by their master or mistress' attentions, or occasionally even the master or mistress themselves filled after sampling the inordinate endowments of their devoted harem
The world is a different one now. Bahamut's Haremtemples are commonplace, their inhabitants many, and often operating as brothels. Their Tiamat-worshipping masters and mistresses take good care of their toys.
Some people wishing to escape their old lives turn to the Harems, and they are gladly taken in. They're soon unrecognisable, another soft, curvy acolyte for the Broken Dragon.
Barring those few without patron dragons, and unwilling to find one after the Breaking, the Kobold tribes' reputation of maliciousness is a distant memory. The average kobold's hips are nearly as wide as she is tall, and a tribe's power is no longer measured in their traps, their treasure, or their dragon... but in how many of them are still capable of walking while attending to their patron's insatiable needs.
Kobolds are now known more for their capacity than their traps, and are favoured at the Harems by the more... productive clients.
    > Party of adventurers.
    > Includes stalwart paladin of old Bahamut, resisting changes by force of will... although his armor has been feeling tight around the hips lately.
    > Reach Tiamat's lair.
    > She rests on her throne, a sight to behold, Bahamut's soft lips wrapped around his sister's thick shaft. His throat visibly bulges with every load his mistress pumps into his swollen stomach.
    > Tiamat commands the paladin to defend his new queen.
    > Paladin looks at Bahamut, who manages to turn his half-lidded, vacant gaze to the paladin. He gives a single, blissfully unaware nod.
    > Party hears several snaps.
    > Paladin's armor has broken off at the hips, unable to contain them.
    > He turns to the party and gives them the same vacant look Bahamut gave him.

Even the unaffiliated aren't safe from the corrupting influence of the Fivefold Queen and the Broken Dragon.
The results of their near endless copulation, known only as the Crystal Queens, now stalk the land.
Standing higher than a man, a Crystal Queen's scales shimmer like the crystals from which they derive their name.
Beautiful, and yet deadly to even experienced groups of adventurers, a Crystal Queen's combative capability is but a fraction of the danger they present. It is not uncommon for those who run violently afoul of a Queen to die not by her hands, but by those of their allies, swayed into destroying them by a bat of an eyelid from what they now see as perfection.
They do not seek out such displays, although many seek them out themselves, spoiling for revenge for their, or their divine parents' actions.
A few Crystal Queens even take up residence in the Harems, which the residents take to be among the highest of honors. These city-dwelling Queens are by no means welcome by the various governments, but with so many people, all of them far more susceptible should the Queen feel at all threatened, they have little choice but to let them live undisturbed, although their almost imperceptibly-slow mental and physical influence on the populace is evident given enough time.
The Crystal Queens are mostly autonomous. They receive little if any communication from their mother and occasional father, busy as she is with... other obligations.
They tend to enjoy polite conversation, and most are quite personable even outside their divine charms.
Reportedly though, their parentage has hardly been wasted. For some Queens, even the slightest provocation can bring out the same domineering personality that often consumes Tiamat.
Whether fortunate or unfortunate, the targets of this frenzy are exposed directly to Tiamat and Bahamut's transformative effects, twisting and changing over as little time as half an hour, although an aroused Crystal Queen's 'sessions' invariably last for multiple.
By the time she has satisfied herself, a Crystal Queen's captive lover is no more, although the Church of Bahamut is happy for the new acolyte.

>tfw you will never be Bahamut.
>You will never have hips four times the width of your waist.
>You will never feel your sister's massive girth fill your ass.
>You will never see your stomach slowly swell under the torrent of her seed.
>You will never be left immobile as she teases you relentlessly over how far you've fallen, and what you've become.
>You will never love every second of it.