"Enjoy having sex with me."

Kurahashi and Matsune had a casual relationship as friends with benefits. One day, Matsune visited a kimono shop where Kurahashi worked with a woman. Seeing Matsune's outgoing manner which was completely different from his usual personality, Kurahashi was delighted and made fun of him. Later, Kurahashi found out that the woman was actually Matsune's matchmaking partner. They continued their relationship after that, but...?