Looks familiar? Well, this is the first in a series of three original doujins. The second one, Sweet Secret, was scanlated by Wings of Yuri a few years ago. The parts are fairly self-contained, so don't bother waiting for the third part we may or may not end up doing.
To make matters slightly more complicated (but not really) these scans came from a yuri omnibus of those three doujins and two other ones about a different couple, hence the advanced page numbers and the ch03 in the file names.