...didn't realise Ichika's that stacked.
Me neither. Isn't she 14 though? Never thought girls in their early teens would have that.
I can assure you 14 year olds can have pretty big boobs, I'd wager that if you ask any women who have gotten breast reductions for back health issues they'll tell you that they had plenty of bust at that age. It does vary from person to person obviously, some people just develop faster than others.