Well, since we don't have the actual text of the 'starfire struggles in red x adhesive fanfiction', we can only speculate. It could be that Starfire is trying to break free from some sort of bond or influence that Red X has on her. Maybe Red X has captured her using some sort of adhesive - which is in the title - and Starfire is fighting against that, both physically and mentally, trying to escape and also deal with whatever Red X's motives are for doing this.
I'm not sure specifically as I haven't read this particular fanfiction. But it might involve Starfire facing some sort of challenges or conflicts while being in a situation related to Red X. Maybe it's about a fight they get into or an emotional struggle between them.
In general, in fanfictions, when a character like Starfire 'struggles' in relation to another like Red X, it could be due to different reasons. It could be a power struggle, where Red X has some sort of hold or advantage over Starfire. Or perhaps it's a moral or ethical struggle for Starfire, if Red X is involved in something she doesn't agree with. Without reading it, it's hard to tell the exact plot points though.
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