Perhaps, the Happiness Cult attracted its followers using this very tactic.
They first enticed people to consume their specially made honey and then somehow induced those who ate the honey to develop a fondness for the cult's missionaries, gradually drawing them into the sect.
However, this tactic wasn't foolproof.
Because Ms. Kurosaki did not mention the Happiness Cult to Kagura Hikaru, she just chatted with him about trivial matters, discussed a bit about Kagura's medical condition, gave some ambiguous treatment suggestions, and then excused herself on the pretext of being busy.
If that jar of honey really was so effective in converting people, she wouldn't have acted so cautiously.
Kagura Hikaru didn't feel disappointed, as he didn't think he could penetrate the inner circle of the Happiness Cult just on his second encounter.
Gaining their trust would likely take a significant amount of time.
But it probably wouldn't take as long as he initially thought.