Lustful Creatures by Harmony Gates
Green aliens, lesbian threesomes and playful exploration. Lustful Creatures is pretty much gonna fulfil your every sensual craving.
Vitishan is a green-skinned alien woman on a mission to explore new worlds and new civilizations. Her current mission, to explore a planet known to her as SOL-47, but its inhabitants call it Earth. She has a very specific mission, to study the phenomenon known as love.
In order to blend in, she transports down to a sci-fi convention in America.
On her planet, they have no physical pleasure, so she throws herself into this world to learn as much as she can before anyone discovers her secret, hoping to unravel the mystery of love and perhaps even bring back a few lessons to her home planet.