HERE'S EXACTLY WHAT HAPPENED!
Don't believe what she says. Those foolish memers assumed that Eren would be the one giving birth. They were so pretentious and egotistical to FORCE Eren to be the uke; but, what if they could both be uke. That would allow them each to have one child a second. Also let's not forget that not all babies come out the ass/uterus.
When they aren't in labor, or frickle-frackling, they are having brain children together. That would greatly diminish the wear and tear on their honed bodies.
Also let us not forget Yui. Yui never came out of Asuna or Kirito (#SAO). She was a computer program. However, she truly was their daughter.
It was cruel, insensitive, of those meming-shitfaces to not take into account adopted children, or pets. I still consider my deceased fish, Lucifer, my favorite brother, despite having three human brothers.
Just picture a beautiful world, where they could hold each other in rapturous embraces as they gently stroked the pristine pelvis of the other. Doesn't it make your kokoro doki-doki?
That is the rakuen that I yume of, a world of pure yaoi bliss.
Join a worthy cause, as we fight for a sekai no niwatori kire to herikoputaa.