@ 7 Two Gun Angel: I was talking about Wikipedia's page on the parent magazine, which I linked to.
Regarding the manga (I think there are translations of the original web stories around, but I haven't read them): It's a light, fanservice-driven situation comedy (one brother is totally into making costumes, one hates crossdressing, one says outrageous stuff, etc). The characters aren't given ages at all, as far as I can tell, but the second-oldest seems to be in high school.
There is no sex, onscreen or off, and no full nudity, but there are lots of pantyshots and skimpy outfits (swimwear, underwear, etc.), a few bathing scenes, plus a number of raunchy jokes. There's a lot of fanservice, but it's fairly light and cheesecake-y (no groping or Not What It Looks Like
The characters look like typical bishoujo
, except not. Some might think they look underage; they just look like typical "cute crossdressers" to me, but I'm pretty inured to that art style.