Transmutation, Emmission, Manipulation

First, the user asks their target for a favour, then they transmute their aura into a small fly which can then be 'attached' to the target. The fly will simply float around the targets head making an irritating buzzing noise until the target does the previously mentioned favour for the user.

The fly is entirely intangible and cannot be touched, so swatting it won't make it go away. If the target begins to do the favour, the fly will become quieter, and will fully disappear once the task is complete. The only other way to get rid of the fly would be through some form of nen exorcism.

I imagine this ability being used by a really naggy parent or something- guilt-tripping people into doing things using the fly instead of actual guilt.