There's some serious breast expansion in a Japanese anime called The Qwaser of Stigmata. It occurs in episode 21, just a little under 8 minutes into the second half at this site. The storyline doesn't make a lot of sense. It's anti-Christian but in a way that accuses Christ of all kinds of crazy nonsense, as if the Apostles were vampires or something. But it has lots of big tits and some breast expansion, so whatever.