Dahlia doesn't know that Venti is Barbatos. What he does know is that he's hopelessly fallen for his best friend, Venti, and he isn't exactly allowed to pursue it because of the oath he had taken when he became the deacon to stay celibate. So he prays to Barbatos to make his feelings go away and confesses all of the things he wants to do with Venti. Venti, on the other hand, heard all of this due to his powers as the Anemo Archon, so he pays a visit to his dear friend.
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