Some alien species require a host or some kind of partner to begin in their mating. There we have two Castenist worms that have been set in a mating pain at a galactic zoo. Two female zoo visitors have volunteers to help out with the worms mating demonstration. As you can see, on the underside of the worms is a lose membrane sack, that the worm keeps tightly sealed against it's underbelly. When mating season rolls around the worm loosens the membrane sack in anticipation of finding a female host. Once it has found a suitable host it will quickly swallow her into through the small mouth opening at the top. Their are pleasure tendrils inside the sack along the underbelly to help keep the female entertained and complicit as it looks for a mate. There is also one long cock tendril that the worm will start working into the female host ass, slowly working it all the way through her body until it comes out her mouth. This is the worms main mating cock, once it has found a mate with will take turns working their tendril cock into the mouth of the other worms female host. There they will lay egg's inside the females stomach where the other worm can take it's time to fertilize them. They will lay one egg at a time, remove the cock tendril, so the other worm can insert it's cock tendril into the other females host mouth and lay it's egg inside her. Then to remove its cock tendril so the other worm can repeat the mating egg laying process. Mating or egg laying like this can take hours or day's before all egg's have been deposited inside each female host. Once all the egg's have been deposited the worm will head off to find a place to rest, limiting their movement as much as possible. They will mostly be sleeping for the mouths it takes the egg's mature and hatch. The larva will spend another 4 mouth living inside the female host before leaving her body, but only to stay in the membrane sack with her. This whole time the female host is keep alive being feed on a nutrients the Castenist will feed her. The larva will feed off the female host breast milk and other pleasure juices. Almost a year later the adult Castenist worm will force the female host out of the membrane sack along with the larva. The larva have grown to be about two feet long by this time. Some will head off on their own as their now able to live on their own, but some may still want to stay with their female host. Now that leads into something completely new and different.

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