One day, the two of them were out together, and this happened on the crowded train ride home.

Guest was holding onto a strap, while Sakuya was standing without holding onto anything.

──The train lurched violently.

Sakuya loses his balance and is pushed forward.

In that moment, Sakuya's hand lands directly over Guest's hand, which was gripping the strap, pinning it there.

The story continues however you like!