Sakura and Shirou
Quickly understanding the meaning of the man's gesture, Sakura took a seat on the bench and, soon after, Shirou joined her, sitting in between his beloved and the strange but seemingly-nice man.
On hearing his question, the two of them considered it for a few moments, Sakura looking in Shirou's direction for guidance as she did so, but he quickly decided that there was no harm in explaining at least the basics of their situation to him. After all, it's not like it would give away anything important.
"OK, sure, I guess we can do that", Shirou responded.
"So, do you want to start first, or should we?" Sakura added.