A few of my favorite cybernetic TF tales:

Sync, by Kotep:
https://www.sofurry.com/view/1266358
Excellent first-person perspective of transferring one's consciousness, and accepting one's new self.

Belong, by Fractured Puppet:
https://readonlymind.com/@bzarcher/Belong/?t=lsl18wc
A more gently paced conversion, with an emphasis on, as the title implies, finally /belonging/ in your body, and with those around you.

Repossessed, by demurePet:
https://www.deviantart.com/demurepet/art/Repossessed-403209098
Even more gradual, with a wry sense of humor running through the exchanges between the two parties.

Soft Hardware, by ZatieLunaVulpe:
https://www.sofurry.com/view/1285641
A fan of an author's writings gets to experience such themselves.