...does this count as incest?--the thrilling conclusion!

Alright, a little background. First of all, I use quite a few mods that have contributed to putting me in this situation, but here we are.

Anyway, I have a pair of vampire sims. One's a scientist, so they get abducted...fairly often. This has resulted in two pregnancies, first with one of them, and then the other. BUT since they're immortal, by the time the second pregnancy happened, the original Pollination Technition had died off and been replaced. So technically, the kids from those two pregnancies aren't biologically related AT ALL. Also, the first alien baby was cloned and the second pregnancy was twins, so there's four kids now. The older aliens are both vampires as well and immortal so while they were basically grown by the time the twins were born, all four are currently in the young adult stage now.

Point being, I've been seeing some whims to for the two different sets to flirt with each other, and my question is...do I go with it? What's the scale of creepy on that?

I'd really appreciate people's thoughts. Feel free to ask any clarifying questions, the whole thing is a bit confusing lol.