Oh, Dear . . .

Got two;
I had a save where I had my sim get as many people pregnant as possible and eventually it got to the point where it was hard to find someone who wasn't his kid. I found a girl who didn't have his bright red hair and I checked my family tree to see if she was there. Didn't see her so she must not be related, so I just quickly talked to her so I could invite her over so I could use my vampire powers to seduce her (flirt burst and that odd pink mist ability) and when I tried to romance her I couldn't.
It was his grandchild, I quickly kicked her out (funnily enough her father and mother had red hair)

Another time was when I tried making my sim's thralls depressed for fun and I misclicked and made them very flirty instead, didn't have the energy to fix it and the entire time my vampire was going about his day you would hear the sim's below going "Ooh la la" and all that while flirting with each other. Made his morning kinda awkward