In English I believe a Flummi would be the equivalent of a bouncy ball, which may or may not be an official term.
Now thats out of the way. I love the story, I could totally see the dursleys being that gready.

CS

Ohlala! Nice, though I can't help but imagine a Thousand Little Deaths (Of the unpleasant kind, mind you; you never know what's wrong with some of the people on this site...) for the bastard Fox. Overall, very nice, but when people exploit and/or hurt kids, it makes me Angry.
And you wouldn't like me when I'm Angry.
Unfortunately, that's more due to my being sullen, moody and "pouty", rather than any pseudo-gamma ray-induced spontaneous mutation into a green, tank-smashing beast...

Wow, so Midas just walks away and leaves behind a huge mess.

Well let's hope Harry finds freedom not more slavery at Hogwarts.

Nice, at least those in charge of Harry now are in jail!

Hmm seems that Marchbanks is quite smart here in figuring things out.

Good Harry is starting to not trust those around him as they do not mean him any good, only Snape does.

Well good, at last Severus knows the truth now!

Yea Harry is lucky to have Midas, the only reason he even cares is for the money.

Petunia is just as bad as everyone else in using Harry!

Wow, I do hope Severus finds out about the muggle (for it only could be) muggle listening devices.

Wow, poor Harry at least Snape fixed the damage.

Yea good going Snape you nearly blinded the kid!

Yea Harry is a spoiled brat here, so not!

Oh dear Severus is not being fair here at all!