'You've quoted me to support your views Outraged but I really disagree with you'
I know! I agree totally with your definition and yet it leads us to two different conclusions!
'she had consented to a different physical human who wasn't there in that room. I don't think that the fact that the person she actually consented to was fictional'
That surely is contradictory? How can he be a physical human AND fictional? He can't. She consented to the person in the room and she did so without looking to see who that was. She consented to the person that she arranged to meet. He didn't look as he described himself, but it was the same person that she was chatting with online. What he said online was all lies, but it was not a separate person.
If someone has sex whilst under the witness protection scheme, without revealing who they really are, are they a rapist then?
Or is the key detail here that he didn't look like he said he did? If he used a correct photograph, but lied about every other aspect of himself (name, age, marital status, religion, hobbies etc.) would that be ok? Or would that be rape?