Is this a morph? Or is Mio that huge?
She actually appears to be a smidge LARGER than that nowadays. it's a particularly "inflationary" view of her boobs, so it's not easy to judge generally, because in that pose she appears larger than (her) normal, just due to the way her boobs are positioned on her chest. But the more recent stuff shows her to be a cup-size or two larger. At that point I believe she was a 38Q; now I believe she has said she's 38R. but given her overall breast hugeness, one cup-size for her is a LOT of additional volume.
For me, anything above a g-cup is very substantial, and she is super-busty. She clearly has some form of breast hypertrophy. I don't know if she has offspring. if she has a ch1ld, she doesn't have Virginal Breast Hypertrophy (VBH) or gestational breast hypertrophy (she's not pregnant), but something else. I am a huge fan of hers, as you probably guessed.