The inciting incident is sexual assault - at least metaphorically. It happens before the player defines anything about their Tav and is the one shared trait between all player characters. Whether or not Larian recognise it, sexual assault is at the thematic core of the BG3 experience.
Do you mean that this spiked horror crawling into my eye socket is metaphorical sexual assault?
If yes: that feels far fetched for me. That fanged monstrosity slipping through the eye socket into your skull is one of the ways to get a parasite that are the most far away from anything sexual, neither for the one suffering it, nor for the mind flayer infecting you.
It is powerlessness and torture, but very far from anything sexual. At least from my perspective — but I am no survivor of sexual abuse, so my perspective is limited.
Do you see a way to get a parasite that would both be similarly horrific and be something you would not see as metaphorical sexual abuse?