Oh, branching off the LIFC, Betty is dating Bruce, but Hulk co-occupies, so what is Hulk to Betty? Meta? Polywog (child of poly partner not necessarily yours)? Co-made kid with Bruce, assuming they treat the experiment as Hulk's "birth"?

Also, Bruce and Tony have a deeply enmeshed Thing, which Betty joins in on, so is that a form of nonsexual poly? Theirs is less explicitly siblings than Clint and Tasha or Bucky and Steve, and you KNOW Tony has at least met a few Poly people, so what if he just casually starts referring to Betty as his Meta, and then we get to learn some new words.