It's not a doujin. It's a 6-page story from Comic HotMilk vol.05 (2008-06).
This sucks...s!!...wait.Oh.Wear them
I wanna see it tooVarious Things In Unknown PlacesLove burumaWha-wha-wha-wha-
What is this...I found them on the net earlier...Just as I thoughtTight in the crotchTh-th-th-thClatterHere they are.What the hell are you doing?!Me!?Wear them.Wear them.Uww...As if !!!