First Kirino(post #840903), then Kirino's popular friends(post #948407) and now he's starting on Kirino's otaku friends? Hopefully he won't get to have his wicked way with Hinata and Tamaki too. These pics remind me of all those ero anime stories were the 'dad' marries into a family to get at the daughters, such as Oni Chichi.
Not sure about the armpit_sex tag here since he isn't using her armpit. Looks like some kind of hair/shoulder sex.
Monki said: Not seen any of this guy's doujin works. Does Ruri have a vibrator inserted there?
Look up Studio Parm and the "My Father and Little Sister" doujin series. There's 3 books out right now, Kirino is book 1, Manami and Kirino are Book 2 and Kirino, Manami, Ayase and Kanako are Book 3. Book 4 is looking to be the last one in the series and will be Kuroneko and MAYBE Saori.
I say MAYBE because she hasn't made any appearances yet, but I can't see the author leaving any member of Kyouske's harem un-NTR'd.