I can understand why, I imagine it might be something of a mood killer for other, less interesting folk.

You needn't worry about me telling anyone, if you're concerned about it. I certainly take no issue, after all you refrained from biting me.

[He may have chowed down on someone else, he may have drained multiple people since he got here for all Jarlaxle knew. But they weren't him so....]

Your secret is safe with me, I simply found it an enlightening experience. Like the copper dragons, for instance. Also equally enlightening.