Yeah, fucked-up aside it would also be pretty stupid because unless Fujino added even more unrealistic NTR logic then Yui would still come out with her memories and feelings the same regardless of if whoever knocked up her whore of a 'mom' to make her completely unnecessary new body XD
The issue is that just actually introducing Yui into the game would make it impossible to ignore all the plot-holes her still existing bring and actually put them to the forefront whenever she's onscreen, so I would honestly have preferred if Fujino kept acting like she didn't exist tbh.
Also
HentaiBaka, dumb jokes attempts aside, please consider erasing that before we're flooded by a hundred people messaging if this is real or not/complaining-lamenting that Fujino got delayed and a mod ends up locking the thread right before the Update again :|