Baby's Got Blue Eyes (гет)

Prompt #73: Elliot knows he hasn't slept with Olivia. He's positive; that's something he'd definitely remember. So why is it that her son has his eyes? Elliot never left, but right around the time Olivia got custody of Noah, he had to go for training or something and completely missed that she was fostering and now our poor dummy is very confused and Olivia is oblivious to his confusion