Why do I have a feeling that Demeter won't accept this answer?
1. "Your daughter was lured into a trap by my brother who wanted to help my sorry ass because I am too shy to ask for her hand, and I couldn't drive this chariot, and then we ran into Helios - quite literally, Eos is the witness for it -, and then we got caught on fire, so we had to land somewhere in some water because the vegetation was dry you see, but it was lush and then I remembered that in such a case there must me underground water, and see, I do happen to have some underground rivers, so we took a turn for it..."
2. "I love your daughter so I kidnapped her to make her mine."