"Do not worry about your little girlfriend she is fine for the moment, See she is part of a BDSM club bet she never told you that."
"Well the little tramp made a bet with me and lost and for her punishment I have tied her up and decided to make you her loving boyfriend perform tasks for me."
"If you complete all the tasks to my satisfaction you can untie your girlfriend and be free to go of course if you don't I get to keep you and your girlfriend as my little play toys."
"Of course you don't have to stay and play at all if you want to I mean you can always leave her tied so nicely to that chair and I can come back and have my wicked way with the sexy slut."