Responses

At least if together with Hestia, Helios would be no more awkward than being together with his own wife, Because from the beginning Helios's relationship with Hestia was not as bad as with Diana Besides that, the one who feels anxious, I think, is not Helios and Hestia but Kaelus because he has a very high sense of jealousy.
At least in this story, Diana goes with Helios, because in the novel Diana goes alone to Kael's residence.