sauce?
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clothing reminds me of mahou shoujo ai, the doujin or maybe the game.
I'm pretty sure this is standalone; i haven't seen any others like this.
Definitely related to Mahou Shoujo Ai...Looks like one of the "Extra Story" fan disks ~ flash stories that complement the H-Games. Both the art and costume match up...Rare on the net unless you buy it. Haven't found any torrents.