That's way too literal of an "ironing board".

flat as a [ironing] board

Aren’t they ToraDora!’s Aisaka Taiga and Takasu Ryuuji?

Well, given the designs, the joke, and Ryuji's love of cleaning... I'd say it's certainly possibly them, maybe.

Don't forget the tiger stripe panties...

That's such a mean picture.

Well at least you can say her chest's really hot right now.

his shirt says "I Heart DFC"

Oh, sick burn. Uhm.

does this count as "Too Literal?"

Flat as a board!

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