Rider
As soon as they had arrived at the house, Sakura climbed down from the horse, before moving to help her shivering sister do likewise.
“Nee-san, you’re shivering, you need to get out of those clothes, they need to be washed. Come on, I’ll take you inside", she said, concerned for her sister's welfare but also clearly overjoyed to have found her again after three long years apart.
Rin nodded, and prepared to follow her sister, when she looked up and saw the house that she had been staying in. Rider could see the horrified look appear on Rin's face as she realised where her sister had been living.
"You've been living here all of this time?" she asked, before pulling her sister into a hug.
Rider could not blame her at all. She herself was still amazed Sakura was willing to live in this place after the hellish torments she had suffered there. The Sakura from her home universe had had the house demolished years before. At the same time, though, she knew Sakura had extreme mental strength, so she doubted it would phase her anything like as much as Rin expected it to.
Sakura, however, reacted with surprise at her sister's response, stammering about how the house was safe, before noticing that her sister was freezing and dragging her inside, into the warmth, clearly concerned about her health.
Whilst the two sisters were heading into the house, Shirou had also dismounted from Pegasus, and was following shortly behind them. Once he had done so, Rider dismounted also, before de-summoning it and, then, changing back into her casual clothing.
She watched Shirou approach the door as Rin and Sakura entered the house. He stopped for a moment at the entrance, contemplating something, before entering, with Rider following him through the door. Once she had entered, she could hear Sakura and Rin walking up the stairs, still talking. It was fairly obvious that Sakura wanted to spend a bit of time with her elder sister right now, and get re-acquainted with her. So, she would have to look after Shirou.
“Shirou, I think we should leave Sakura to spend some time with her sister”, she said. “The living room is through there, if you need anything then please ask.”