The doctor didn’t actually keep the zombie because he was alive. After his eyes turned back blue, the doctor ran no tests or anything to ensure he wouldn’t attack or turn back into a zombie imedeatly. After the loss of his lover and having difficulties finding a replacement or a one night stand type of deal due to him being in the literal zombie apocalypse, I think he was so sexually frustrating to the point where he planed to fuck the zombie. That seams logical for his intensons at first, but I think after finding out the zombie could be very human, he decided to wait and have a healthy relationship with the zombie instead.
(TRIGGER + SPOILER WARNING)
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The doctor didn’t actually keep the zombie because he was alive. After his eyes turned back blue, the doctor ran no tests or anything to ensure he wouldn’t attack or turn back into a zombie imedeatly. After the loss of his lover and having difficulties finding a replacement or a one night stand type of deal due to him being in the literal zombie apocalypse, I think he was so sexually frustrating to the point where he planed to fuck the zombie. That seams logical for his intensons at first, but I think after finding out the zombie could be very human, he decided to wait and have a healthy relationship with the zombie instead.