Downloading Keittai: Riding the Pleasure Express (Trance in Transit Book 2)

Kei is in every way just another woman living in japan. She takes the bus to work, and sometimes she gets a special call that tells her she gets to ride on a special bus. The protocol for riding it isn't all that special.
She just has to cater to another woman's desires as her riding companion. That's just polite.
A story of casual dominance, control, and lesbian heat featuring a Japanese protagonist.