It will look like I'm telling the D not to investigate me, but it doesn't really matter much. I have nothing to fear. I can be investigated.
What I mean is that I know I am a C. If the D investigates me it will be a lost investigation. Then I can be recruited if I'm not whacked, so the D will trust me as a C while I will be a G. The D will get nothing from investigating me.
But I know this while the D doesn't know that I'm a C, so it's normal to investigate me. It's just a pity from my point of view, since I know what the D doesn't know: I know that I'm a C.
There, I just made myself even more suspicious.
If the D investigates me tomorrow and I'm about to be lynched later in the day, he/she should stay quiet and just vote for me if I have too many votes. The D shouldn't publicly try to save me.