In basic FIML, tone of voice during a FIML query ideally will be neutral.
In practice and as time goes along, partners will find that it is not as important to maintain a neutral tone of voice during a query as it was in the beginning.
What is important at this point is for both partners to understand that when one of them queries the other, if there is a discernible tone of voice when the speaker makes the query then the listener should assume that the speaker is wondering if the listener is thinking whatever. The listener should not assume that the speaker is thinking that.
This opens the mind of the listener to a kaleidoscope of potential interpretations while relaxing the speaker, who knows that the listener is not judging or interpreting prematurely.
A listener to a query should understand that the speaker of the query may be wondering if the listener is thinking something that statistically is less common than something else. Let’s say that the speaker is wondering if the listener (their partner) is thinking something that only 5% of listeners might be thinking in that situation.
Their wondering about something with a statistical chance of 5% is of some interest but is not of any particular emotional or intellectual concern. It doesn’t matter all that much if they are wondering about something rare or common, something unusual or usual.
Indeed, creativity is sometimes vaguely defined as the making of rare associations. Why should either partner fear wondering about something rare, let alone common?
It is not the job of the one being queried to have a strong interpretation about what the speaker is asking or why they are asking it or what they are imagining as they are asking it. Just answer the query honestly as per FIML guidelines.
After a while, after the basic query has been completed, the one being queried may or may not explain why they were wondering what they were wondering if they had been wondering anything. At that same point and not necessarily before or after the listener, the speaker might profitably reveal what they had imagined the listener might be thinking. Or what they wanted to be sure the listener was not thinking.
Understanding the above will give both partners access to much wider and more various contexts than is normally possible. Having such access frees both partners emotionally and cognitively from conventional and idiosyncratic confinements, expectations, habits, limitations, and so on.