Of course it was! I keeled over from the summoning and the next thing I knew she was refusing to leave! And trust me, trying to ditch her is way more trouble than it's worth. I must have wasted two weeks of my life trying.
[regaining a bit of his intellect, here. Appeal to her ego, you idiot.] It'll be much better having you there. If she steps out of line, you'll be there to take care of it. She won't stand a chance.
[Not that he wants that, but he also knows Saber enough to feel confident that there won't be any crossing of lines. She's made that perfectly clear.]