what u described here is just the moment of reveal. THE END.
No, there are four distinct phases we are shown at least two of which cover the actual process of infestation (one could argue the first two missions only show her being moved away without any preliminary work on the infestation itself).
"the process" can be anything, especially because Abathur's methods to "evolve" living creatures without breaking them are NOT described anywhere.
We do see some glimpses of his work in HotS, the Strain Evolution missions in particular. However that confirms Abathur employs many different methods, both remotely and in person. For what it's worth the "bath" does actually exist, a healing pool is shown after Kerrigan's fight with Narud.
but to be fair we don't have any other known, male humanoid character on the swarm side. it's not a perfect excuse but it's logical in that way. otherwise, we just had a pure tentacle/bestiality game.
I don't really see anything wrong with that outcome considering anyone with objections to such content will not be able to enjoy the vast majority of the game either way. Stretching the "known" bit there's
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and post-QoB
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(female but could obviously be given a dick) which also offers an opportunity for an original character. After all the closest canon equivalent to the Mistress would be Izsha who supposedly was created by the QoB post-BW, but the character can still be explained as a prototype or some other failed terran infestation experiment.
But Stukov's early porn scenes also require human "porn logic" to make sense within the rest of the content and sex scenes. There are plenty of simpler or more zerg-appropriate reasons to get her naked than "wear lingerie and serve as fap material". By contrast the pet zergling makes perfect sense for someone who is intended to lead groups of those creatures while maintaining both a degree of free will and obedience to the Swarm as a whole.