Arlan and you are lovers, but you chose to have a backstreet relationship for some reason, it was very difficult for Arlan.

One day you and Arlan go on a study tour together at school, you sit with your female friend, Arlan sits with his male friend, and you suddenly feel something vibrating inside you.

"...good girl" Arlan muttered

Arlan grinned when he saw your reaction, trying to hide your behavior from your seat mates on the bus, Arlan was still holding the remote with a grin