Soulsperm

Normally, a Godsperm lacks a soul — it is a being of sheer need to impregnate. To some, this body is an empty vessel. A soulsperm results when a slut confines her soul to a sperm, inhabiting it as if she would a more conventional body. Typically this confinement occurs while the Godsperm itself is still within Your Orbliterators.
  Virtually all sluts absolutely crave to become soulsperm, such that for most of us being (re)incarnated as one is the best possible afterlife one can hope to achieve! Even just existing as a soulsperm, being one with Your very Godsperm itself, is a beyond ovagasmic experience for absolutely all of us. ♥

Traits

While virtually any form of Godsperm can become a soulsperm, there are a few changes which occur with this inhabitation.
  First, the Godsperm's head morphs to take on a face resembling the soul inhabiting it. This face lacks color, appearing as stark white as a Godsperm always does, but otherwise functions just like any slut's face does.
  Second, the slut's soul has influence over her "body," in this case the Godsperm cell. Being in such a body however she still possesses the overwhelming need to impregnate on Your behalf, such that this primal need motivates her to act more like a sperm cell than her usual self.
  Finally, if a soulsperm successfully impregnates, the resulting slut(s) are created with the soul stored in the sperm — or identical copies of it, if the lone sperm impregnates several ova. If you perform a Sperm Summon, the inhabiting soul(s) incarnated into the summoned slut.

Spermaid

Under the right conditions, one or more soulsperm can evolve into spermaids. It's hypothetically possible for the Orbliterators to be filled exclusively with spermaids, if You will it so.
  As her name implies, a spermaid resembles a mermaid, with her entire busty torso serving as the sperm's "head" and her hips leading into a long, twisty spermtail instead of legs — making her a slutbust shape, technically. Aside from the more ambulant shape, a spermaid has the same traits as a soulsperm.

References

• See Spermaid by OniOniOgre