The goddess is 100% sexually teasing him, that is her thing without actually prompting him or directly offering anything.
In this world all the other gods, goddesses, and demon lords are all either dead or banished during a war over 1k years ago, but the remains of their armies are still around and without anything to command or control them, they do what they want.
Think of Goblin Slayer meets witcher, the young man becomes the witcher without the potion/ritual thing