SolarFlare13

 Pish-posh! A surprised expression or excited anticipation does not denote untoward connotations!

  Example One is irrelevant. Bikinis aren't a thing in this mostly clothing free world, so that's merely coincidence & a "don't this look funny on her?"

  Example Two is often referenced for this, but this is Fluttershy after all. Think she'd be embarrassed like that if anypony barged into her bedroom, regardless of what she was wearing.

Most are purely coiencedental and Out-of-Context. Example Seven & the last one, is of course supposed to represent them tired from taking care of their baby. Regular fatigue. I can tell that from the nearby foal carriage.

 Example Five, I can maybe give you. Getting sprayed for any reason doesn't mean anything...but... what with it being something white like milk, it does have me worried.

  The question is though, parents got all upset over the Derpy Debacle but none of this?

@Widdershins

"Example One is irrelevant. Bikinis aren't a thing in this mostly clothing free world, so that's merely coincidence & a "don't this look funny on her?"

  Example Two is often referenced for this, but this is Fluttershy after all. Think she'd be embarrassed like that if anypony barged into her bedroom, regardless of what she was wearing."

The first two are based on the the fact that they're not wearing any clothes and they're trying to cover up their "private parts"

As for the last one?  Well...it looks like they've had waay too much sex, so that's why I put it up there

The fifth one looks like...well...you already know  I may as well include all the other pics of Pinkie smooshing her face in cake (...and changing the colour of the pastry), but that would be too obvious...

"The question is though, parents got all upset over the Derpy Debacle but none of this?"

IKR!?  There's A LOT of adult jokes in MLP and they don't get offended by that!?

They should be more offended by this than some-pony who's supposively acting like she's 'disabled'...