AITL for seducing him?

I (ya, f) recently had a ONS affair with a wealthy married man. As a result I became pregnant with his child. He denied it was his child constantly, saying his wife and children could never find out.

I gave birth to our son recently and immediately took him to court, I got full custody and he has to pay child support so, Surprise! Now, his wife is gonna know... and his kids will know whether he tell them now or they find out about little Eleazar after he pass away, doesn't matter!

My twin sister is saying I'm a llama as it's public knowledge that he's a wealthy married socialite, so am I the llama for seducing him?