Yeah, i think i would like to see that. However, it is a little late to introduce Players to that idea. Some could argue why Asuna is not a piggy... But i guess if there is a Yui, that means no other artifact hunting is needed? I mean not even a dungeon crawling is needed. For me it's like we will miss a little bit from the game feel.
However, in some parts of the world when one girl says about other "you are such a cow!" that usually doesn't mean thinking highly about that girl or woman. So, in that context it might be appropriate... Also, maybe we will be introduced to lactation of some sort. Or breast feeding... getting her more to the idea of how it feels. Yeah, i think she could be corrupted more by that.
And same goes for men. If she says, "you are such a Pig in bed!" that usually means she didn't like all of it. Nasty sex or whatever... But when she says "... such a Bull!" it's like she was fucked good or at least came from fucking.
Edit: Plus, i don't think Kirito will see her like that. She is too similar to Asuna anyway. So, there is no chance he wouldn't recognize her. So definitely this gonna be Inoda + Asuna sex scene. Giga Chad Kirito wouldn't believe that it is a clone of Asuna, like Liz does her clone in her Shop, right? (Liz Doll)

And OFC we cannot buy any equipment from her anyway... so what's the point of that... Hentai Logic.