In order to provide Alexandra with the nutritions she needs and connections to the food tank and oxygen tank inside Alexandra’s breasts, a special phallus-like device is inserted into her anus and large intestine.
It comes in the form of a long rubber snake-like phallus-shaped, device and reaches from her anus all the way through her large intestine, ending at the start of her colon. There, it then transitions over into the supply connection.
The end residing within Alexandra’s rectum has the same balloon around it as the catheter, and once fully inserted, is inflated with a biocompatible polymer, growing its size so much, it fills the rectum and becomes impossible to pass through the sphincter any more. This traps the entire device inside Alexandra’s rectum and large intestine. Over time, the polymer inside the balloon also begins to dissolve the balloon and then grow together with the surrounding rectum tissue.
The anal plug is so large, it pushes apart Alexandra’s thick butt and glutes, further increasing her extreme proportions and opening her butt crack heavily.
The anal plug then connects to the ends of the connection tubes of the filtration devices inside Alexandra’s butt and hips, that end in her rectum. This completes the connection for the filtration devices to the entire nutrition system, allowing for efficient recycling.
Only a very small section of the anal device is still accessible through the sphincter, which features multiple ports for the tanks and requirements:
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One for oxygen, through which it is pumped through Alexandra’s supply connection into the tank inside her left breast
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One for the liquid nutritional solution that ends up in the tank inside her right breast
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Finally, one to administer enemas to Alexandra. Throughout the entire length of the snake-like phallus within her large intestine, it features valves to evenly pump the cleaning solution and liquid into Alexandra’s bowels.
All the ports are under the full control of Lumina and can be opened or sealed at any time. The enema port, in particular, is strong enough to trap any enema volume within Alexandra’s bowels, holding in the immense pressure and forcing Alexandra to keep any amount of liquid within her.
Another main function of the anal insert is bringing pleasure, pain, and stimulation. The entire plug, from end to end, is able to administer powerful shocks. It can also heavily vibrate, gyrate, or thrust, contracting and expanding, essentially fucking Alexandra far deeper than anything possible before. Especially due to its size and length, any movement by the device causes Alexandra’s entire body to convulse, as the stretched large intestine is shifted around by the massive object inside. Any kind of movement or expansion is also immediately visible on Alexandra’s miniscule waist and abdomen, as the anal plug fills a large part of the space between her hips and inside her abdomen.