I looked recently at the old 2012 bonus featuring the girls of SJI and it said there that Erin's boob measurements before all the madness were 32H-28-34
I'm uncertain how to feel about guessing only 1 cup size off essentially. I need a new hobby is primarily what comes to mind. Those are pretty insane numbers in reality, but of course this is pretty far removed from that.
I think my general numeric approach remains unchanged, it's just effectively a 1-2 inch difference with her starting as an H over a G and she's still easily larger than most women would ever become even artificially. The only exceptions to this are the women like Beshine or Chelseacharms and while I'm aware of these women I've learned even my fantasies have limits that shouldn't be approached in reality.
It's a fetish for a reason, after all. Much like the mind control this site is focused on I don't think an actual sex bot would be all that exciting after a bit of time with one, as you'd have to take care of some basic needs and things that most stories conveniently leave unexplored. Or for the other nerdy pull playing DnD and skipping over inventory and ration management at most tables, most DMs and players don't enjoy doing those things and that game allows you to hand waive it off.
Nobody writes stories about sex-bots and the aftercare required for a mindless woman (or man though that's a much rarer phenomenon) whose only thoughts are sex. How do they eat,?can they still sleep? Do they still function in real life? The latest story Prompts is a great example of hand waiving off any consequences an actual mental shift would induce. Those women conveniently return to a relatively normal existence once not in a hypnotic state.
As is true in most BE porn, there's very few stories of consequence in the community. Those that do explore it tend to go to extreme measures of mental gymnastics that would be required for such a woman to not be driven mad. There's one at the overflowingbra.com now called Motionless that is attempting to do so and even that fairly realistic take on a woman with such an extreme case of breast growth still ultimately has to make her a nymphomaniac with little other desires left to be realized to be convincing enough she wouldn't just get them removed via surgery. Double masectomy is probably not a convenient or easy discussion buts it's almost certainly preferable to a life literally burdened by the weight of huge tits.
Just as we've done so here with Erin and company with their drug induced hyper breast growth... whether it's the comics cannon or not. I don't expect to explore such facets of the fantasy and don't think it's necessary either.