Wren, you're dead right.
Get the (fan translated) manga at
http://www.mangatranslation.com/The manga is from the guy (named "Oh Great" - really) who
did "Silky Whip". Tenjo Tenge is one of the best drawn
mangas around and I use it as style reference. Shame to see
what they did to it in the (average) anime.
Moreover, the point is not Maya's tit growth but her
bursting out of her kimono. She's big anyway and her tits
grow in sync with the rest of her body.)
Those two scenes are the only inflations in the whole
work. BUT all delicious, hard hitting girls are DD+.
The artist obviously wants to get over hentai and his tit
fixation, so in his most recent work (Air Gear) there's no
echi and some girls are actually flat

I feel his pain.