Book I - Jupiter transforms Io to a Heifer

"Bk I:601-621 Jupiter transforms Io to a heifer

   Meanwhile Juno looked down into the heart of Argos, surprised that rapid mists had created night in shining daylight. She knew they were not vapours from the river, or breath from the damp earth. She looked around to see where her husband was, knowing by now the intrigues of a spouse so often caught in the act. When she could not find him in the skies, she said ‘Either I am wrong, or being wronged’ and gliding down from heaven’s peak, she stood on earth ordering the clouds to melt. Jupiter had a presage of his wife’s arrival and had changed Inachus’s daughter into a gleaming heifer. Even in that form she was beautiful. Saturnia approved the animal’s looks, though grudgingly, asking, then, whose she was, where from, what herd, as if she did not know. Jupiter, to stop all inquiry, lied, saying she had been born from the earth. Then Saturnia claimed her as a gift. What could he do? Cruel to sacrifice his love, but suspicious not to. Shame urges him to it, Amor urges not. Amor would have conquered Shame, but if he refused so slight a gift as a heifer to the companion of his race and bed, it might appear no heifer!" - Metamorphoses

This is the part where Jupiter rapes Io and when Juno walks in on them Io turns into a Heifer. This I thought might be symbolical to the Aeon of Hathor.

I get the understanding here that Io had walked in on people having sex and Jupiter tells her to hide in the shade, but then ends up having sex with her instead.

"Bk I:587-600 Jupiter’s rape of Io

    Jupiter first saw her returning from her father’s stream, and said ‘Virgin, worthy of Jupiter himself, who will make some unknown man happy when you share his bed, while it is hot and the sun is at the highest point of its arc, find shade in the deep woods! (and he showed her the woods’ shade). But if you are afraid to enter the wild beasts’ lairs, you can go into the remote woods in safety, protected by a god, and not by any lesser god, but by the one who holds the sceptre of heaven in his mighty hand, and who hurls the flickering bolts of lightning. Do not fly from me!’ She was already in flight. She had left behind Lerna’s pastures, and the Lyrcean plain’s wooded fields, when the god hid the wide earth in a covering of fog, caught the fleeing girl, and raped her." - The Metamorphoses