So if Jojenpaste is a theory I understand even though I think it’s unlikely, this one just baffles me to no end. Cersei has no motivation whatsoever to bear Robert’s child, and the text from AGOT to AFFC makes it clear she didn’t:
“Your Robert got me with child once,” she said, her voice thick with contempt. “My brother found a woman to cleanse me. He never knew. If truth be told, I can scarcely bear for him to touch me, and I have not let him inside me for years. I know other ways to pleasure him, when he leaves his whores long enough to stagger up to my bedchamber. Whatever we do, the king is usually so drunk that he’s forgotten it all by the next morning.”
Whilst you snored, I would lick your sons off my face and fingers one by one, all those pale sticky princes. You claimed your rights, my lord, but in the darkness I would eat your heirs.
Also, I mean, she’s the Queen. Pulling off assignations with Jaime is tricky enough. Carrying a pregnancy to term in secrecy is simply not possible.
“He asked me questions is all, m’lord.”
“What sort of questions?”
The boy shrugged. “How was I, and was I well treated, and if I liked the work, and stuff about my mother. Who she was and what she looked like and all.”
“What did you tell him?” Ned asked.
The boy shoved a fresh fall of black hair off his forehead. “She died when I was little. She had yellow hair, and sometimes she used to sing to me, I remember. She worked in an alehouse.”
So it’s not just Cersei acting completely out of character based on both dialogue and inner monologue, it’s not just the complete logistical absurdity of the Queen hiding a pregnancy to term, this theory involves the complete erasure of another person.
Now, there are some people who willingly misinterpret the detail about the hair color to argue that this woman was Cersei in disguise, when it is blindingly obvious that it’s just one more piece of evidence for the “seed is strong”/Baratheon dominant hair color gene. This is even more logistically insane: it’s impossible enough for Cersei to hide a pregnancy to term; how the hell is she going to sneak away from the Red Keep to be a single mother to Gendry and hold down a low-wage service sector job?
But what really irritates me about this theory is that (as best as I can recall) it only came about because of that stupid added scene from Game of Thrones Season 1 where Cersei decides to tell Catelyn about a made-up black haired baby. So I blame Benioff and Weiss for this one.