Rakuen Le Paradis, Volume 4 has a manga Advent Calendar on their website> http://www.hakusensha.co.jp/rakuen/vol4/calendar.html?TB_iframe=true&width=835&height=620
Clicking on a number opens a page with a short manga story by one of the creators (controls are the little gold boxes on the left. To see the whole thing, press the control that says 進む, second row from the bottom on the right.) Because it's an Advent Calendar, you can't open the box until that day of the month. :-) December 3 was a Yuri short by Takemiya Jin.