Not really. You need to be aware that people react differently to trauma. There is not only one way trauma can affect someone, it can greatly differ for each person.
While some people cannot experience sexual actions at all after being assaulted without having a mental breakdown or even having to throw up etc. or having flat out ED, others can have a sexual reaction when recalling the things that happened (wanted or not). Much like the protagonist showed: he was forced to feel sexual pleasure and was touched in different ways that stimulated his body further, so now he is in a circle in which he feels sexual pleasure when remembering the assault and, vice versa, he remembers the assault when he feels sexual pleasure.
That is just a realistic portrayal of how a trauma can play out and affect you. Albeit one that is not well known and often ignored.
It is not romanticized. And it is not sexualized either, because he DID feel sexual pleasure when it happened and it is now part of his mental and physical memory.
This is sexualising rape trauma to another level ugh