It's by Kadoi Aya and I think she's from this game http://www.getchu.com/soft.phtml?id=267565. I don't suppose you'd mind translating the title and character names? I think there's also a few more of the cgs on here.
That full title is quite a mouthful. The first part of it is easy, though, "tamatama" - so I'll just tag that. I guess you're assuming it's the second girl on the page, in which case the character's name is Hatsushiba Riko
