"Yep, I want to become a Naga" Rachel said plainly.
"I figured as much," the game admitted, "considering your 'forceful' treatment of Player Quinn."
"Eh, she deserved it," Quinn said, playfully kicking Quinn in the backside as she did so.
"Fair enough. Time to begin the change, then. Oh, and Player Rachel, I suggest you take your seat immediately."
Rachel, not arrogant enough to question the game's cryptic warnings, turned to return to her chair. As she did, her body tilted forward in anticipation of a step. Nothing came, however, and the thin girl toppled over, landing squarely on her flat backside. Her rump connected to the floor with a painful crack.
"Ow, what the hell?"
"Hmm..." the game wondered aloud. "I suppose that was not enough warning."
Rachel didn't even waste the energy to complain, for all the good it would do. Instead, she began a more productive measure, unbuttoning her thigh length blue skirt to see just what had gone wrong. She slipped the item off effortlessly, leaving her nearly bare with only her pink thong to protect her decency. Not that it even needed protecting, really; after Quinn and Alexis's little "incident", nothing seemed off limits for group.
As she looked down the smooth curve of her leg, Rachel was shocked at her discovery. Starting from her feet and running all the way to just below her knee, her legs had fused together. The gap had disappeared, leaving only one large hunk of flesh, smooth all around. It was an amazing sight, though she couldn't help but feel a twinge of nervousness as the transformation moved upwards, fusing her knees together. More importantly, though, she realized that the change would soon engulf her nether region. Not wanting her panties to be fused within her, she tore the underwear off, easily tearing the flimsy item off. She felt bad about ruining her favorite thong but there really wasn't any way to get it off.
Just in time, too, as the fusion made its way up to her genitals. The region, like all the others, fused together painlessly, leaving a continuous sack of flesh from the waist down. The only difference had been her pussy. Instead of disappearing like the rest of her features, it took a spot at approximately where it had been on the new addition. Rachel was glad to have retained her womanhood, though that relief was quickly drawn away as the lower half of her body began to stretch.
It was an uncomfortable feeling though not at all painful. Before long, the pseudo-tail had finished its growth, giving Rachel a little over a length of ten feet in her current position. The next stage of changes were all cosmetic: a beautiful, shimmering batch of violet scales spread across the tail, giving it a more serpentine look. Her tongue and teeth transformed as well, the former growing long and split while the latter grew sharper and more defined.
Rachel could tell that her brain had changed too. It felt more predatory in nature, filling with mischievous thoughts involving various punishments and tortures. Turning her new form towards the helpless Quinn, she felt a jolt of desire echo through her body. True to her snake half, she suddenly lunged forward, her whole body working in concert. She quickly had her tail wrapped around her busty sister, binding her tightly behind her mighty tail. It wrapped around the girl three times: once at the thighs, once intersecting the two pairs of breasts, and finally one just below the shoulders.
"Ah, p-please stop Rachel!" Quinn begged, fighting off the constricting pain.
"Aw, come on, it's just a little fun," Rachel said, licking her sister on the cheek. "Mmm, you're pretty tasty, little sister. If you don't stop struggling, I might have to have myself a little snack!"
Quinn, fearful for her life, froze as did the rest of the group. They did not know how to deal with Rachel, who now was clearly stronger and more deadly than the rest of them. She had always been a domineering sort, but to realistically threaten death? There was little they could do other than continue the game and hope she didn't do anything too evil.
Cosima, feeling the tension, picked up the die to move things along. She let it roll and the cube ended up with a two. Her token lurched forward, moving to its space.
"A two? Not awful, Player Cosima. You're on..."