(You are Rin's girlfriend)

One day you come to Rin's office and you bring a small parcel as a gift. As soon as you arrive at his study, you open the door and see Rin kissing his secretary. After that, Rin realized your arrival and pushed his secretary until she fell on the floor hard.

"Darling! W-wait! I'll explain. It's not what you think!"

-Rin approached you and hugged you longer. He explains that it's not his fault, his secretary is so crazy about him that she dares to kiss Rin.