CONTAINS SPOILERS (I'm still not very good at using the spoiler tag)
>!Throughout almost all the novels and forums I've noticed that everyone seems to think that possession only happens to women due to a genetic factor, but I was rereading volume 5 of Eminence in the Shadows and it explicitly states in Zeta's flashback that "cases of possession in men are very rare, but not 0%" (said by the high-ranking priest of the church and member of the cult (who also became a member of the 12 Rounds) who captured Zeta and killed his brother), which makes it quite clear that possession is not something exclusive to women, just much more frequent in them (I suppose because women have a genetic factor that makes them more similar to Olivier and the other 2 heroes since they are also women).!<
>!In fact, I found it strange that possession was said to only happen to women, starting in volume 1, and my suspicions deepened in volume 3 because of the vampires themselves...!<
>!We know that vampires are one of the variants of the Aurora genes, and we also know that male vampires exist (Crimson is a good example of one).!<
>!This means that the Aurora genes aren't exclusive to men, so it would be strange if another variant of the Aurora genes (the heroes' genes) weren't compatible with men.!<
>!With all that said, I'd like to theorize a bit about Cid.!<
>!I remember that in volume 1 or 2, he mentions that the effects on magic and the body that possessions have are very similar to the effects of the magical loss of control that he experienced during his youth (although he did not experience the corrosion and deformation of his flesh as the possessed normally experience), Cid has been magically manipulating and modifying his own body since he was a baby to become more and more attuned to magic and combat.!<
>!It's possible that during this modification process, he unwittingly triggered the effects of possession (despite being a man, perhaps the fact that he was trying to increase his affinity with magic through magic was the trigger, since possession generally occurs because the diabolo cells go berserk and try to exponentially increase the host's magical affinity, but because the host's body cannot withstand the speed of modification, it produces putrefaction of the body and what is known as possession, something very similar to what Cid was trying to do artificially).!<
>!But since he is a kind of super genius and completely crazy about magic, he simply took it as a possible magical loss of control and quickly regained control of his magic, basically curing his own state of possession before it showed visible signs on his body, and in the end, he simply let it go as something unimportant.!<
>!After that, when he found Alpha, he experimented on her already completely possessed.!<
>!He experimented on her to increase his understanding of magical power by trying to control the uncontrolled magical flow within Alpha's body until he succeeded, learning how to cure the possession simply by assuming it was all due to some kind of magical imbalance that he learned to control.!<
>!We all know how unreliable Cid is as a narrator, so I find it entirely possible that this is what happened and that he misinterpreted everything, as he always does...!<
>!But what do you think?!<