Shirou
Sakura's tears and desperate pleas to her sister tugged at Shirou's heartstrings. He hated seeing people cry, and that applied doubly to his beloved wife. Before he could attempt to comfort her, though, Rin took back control and began to give him one of her patented lectures about all the ways that he could be forced to disclose their location against his will, some of them rather gruesome. Finally, after a good five minutes, she stopped, allowing him the chance to reply.
"Tohsaka", he began with a sigh, clearly upset by the situation that they were all in, "whilst it's not impossible that people could do those things to me, you're hugely exaggerating the danger. For a start, who exactly is going to come after me for that information? The only person who even knows that I'm here is my wife, along with anyone she's told, and I doubt she's going to ask for help from the sort of person who would do those things to me. But, even if someone did try, you're missing something more important. I don't actually know where you live. All I've seen is the inside of this house, I have no idea where it is or how to get here. Even if I wanted to direct people here, I couldn't."
"Sakura", he continued, feeling rather guilty at addressing the clearly-upset girl directly, "you know that you can trust me. I would never allow you to come to harm. You also know that, if I return to my wife without any memory of what happened, she will be angry and distrustful, and may decide to come after you to seek answers. If you wish to be safe, then let me go and I will tell my wife to leave you alone."
After speaking, Shirou frowned. He hated that he'd been forced to address the other Sakura directly and potentially inflame her trauma, but he felt that it was necessary, not only for his and Sakura's sake, but also for hers.