Rider
"Y..yes", Rider moaned in response to Emily's question, enjoying the way the vines were binding and molesting her too much to really consider the position she was currently in.
She continued to moan with pleasure as the blonde servant groped her and the tendrils continued to squeeze and contstrict her, also very much enjoying the sight of the other girl bound and desperately begging for attention as she moaned with pleasure.
Rider's excitement was such that she barely paid any attention to the words of the blonde girl. The giant source of mana that had suddenly appeared was disconcerting, but she shoved that concern to the back of her mind to deal with later. She was far too into this and they were far away anyway. She only made a note to talk to her masters later today about it. However, even as excited as she was, she couldn't fail to notice the sudden storm of rose petals in front of her eyes, or the sudden surge of mana around her, something similar to Shirou's reality marble.
Still moaning with pleasure, she looked around the massive, lavishly-decorated room, which she was sure must be part of the Domus Aurea, Nero's famous palace, before looking back to the girl, who was standing there with her chest puffed out, obviously proud of her creation. Having once been a goddess used to supernatural levels of luxury, Rider wasn't as impressed by it as many people would be. Even so, for a human contstruction it was certainly impressive. And, more importantly, it was some kind of reality marble, a private space which, she presumed, no-one but them had entered.
"T..the Domus Aurea", she moaned, aware that the girl obviously desired praise. "I..it is quite impressive, I have to say. I have not seen anything as beautiful as this for a long time."
"And private, I hope", she added, a real sense of anticipation in her voice.
Now that they were hopefully alone, the real fun could begin. Hopefully, this place would have equipment to assist with the kinkier forms of sex, although she suspected that Emily was capable of improvising a reasonable amount.