This is the HCG from the game "Musuko no Tomodachi ni Okasarete(息子の友達に犯されて)" Only now its in widescreen, I did a lot of searching and found no evidence that the game was released in Widescreen format or so... Still these ones look much more better than the original 800x600 version of the CG.
Official Site : http://www.hs-crowd.co.jp/anim/product/pro_pc2/pcl003/musuko.html