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Six loved working with Cass. Even after that disastrous drunken night out, even knowing Cass would never feel the same way, she still loved it. Every second in her presence was a beautiful torture, and one Six could never give up. Cass was a drug better than the thrill of a good mission.
Although, working with Cass let her do both. That was all Six wanted. They made a good team. It's why House let her get away with only working with Cass. That, and he had something of a soft spot for her. Always funny to imagine a spymaster with a soft spot, but House certainly had one.
No matter what, if it was a simple task or mission impossible, Six just wanted Cass by her side.