Seth had made his request, and now it was up to Rias to decide to fulfil it.
"Is that all you want in exchange?"
"No, not exchange Rias, are you forgetting that you have nothing of value, what is happening right now is that I'll make a request and in your desire to appease me and seek my favor, you will fulfil them."
"Are you saying even if I fulfil those requests there is still a chance that you still won't transform me into a vampire?
"Hmm, well if we continue with the playful request, then yes, there is a chance I won't turn you, but if we get real serious and you perfectly carry out my request, then I'll definitely turn you."
With Seth gripping all the power and placing himself in the higher position of their conversation, Rias knew that unless she desired to portray herself as a hypocrite, she could only let go of her haughty nature and now after Seth's words, she warily looked at him, knowing he was up to no good.
