In general people/fans are possessive up to insanity levels of jealousy even though they have zero claim to "it" at all.I've seen some people even around f95 that think any other male presence in a sexual context is tantamount to NTR. People have some weird hang-ups...
It can just be more apparent in "stories" where the player is the main character. People tend to think "me" too much. A lot of role players can have this issue as well. Too many situations in real life relationships...