Rider
Rider smiled.
"Thank you", she said, sincerely, knowing that Sakura desperately wanted this, and sure from the man's attitude that she was in safe hands. "And, you can of course ask her. But, please wait until after the sex, it would ruin the mood if you discussed her reasoning beforehand."
"Now, should we get going? She's already waiting for you", she added with a smile, before leading him out of the room and to where Sakura was waiting.
Sakura
After leaving Rider and the very-attractive man to discuss "terms", Sakura headed back out into the club, her excitement building as she thought of all the things he might do to her. Checking out the various choices of room they had available, she quickly settled on something which seemed perfect for her needs. It was a plush-looking candlelit bedroom, one that looked like it could belong to a high-ranked military officer. However, on the walls there were indications of a darker purpose, with various devices for restraint and torture adorning them. Additionally, there was a rather-large attached "storeroom", which had been seemingly converted into some kind of torture chamber, containing various larger devices for restraint and torment that would not fit in the main room.
Taking a seat on a chair in the bedroom, Sakura waited with nervous anticipation. Finally, she could sense her servant approaching, her magical signature easily-trackable to her master. As Sakura had expected, though, Rider did not enter the room, instead stopping outside.
"OK, here we are", Rider said to the man who Sakura knew was about to ravish her. "She's waiting for you just through that door."
With that, Rider moved to return to the bar and await her master's call, leaving Gabriel to enter the room. When he did, he'd find Sakura sitting down in a comfortable armchair, obviously nervous and also obviously aroused.