Haruhi sees pictures of a monster girl online and tries to replicate the look.

Due to the other member's prior obligations, Haruhi was the first one after school to get to the SOS Brigade clubroom. Feeling bored with nothing much to do, she surfed the web a little on the club room computer. Then, she saw it: some site about 'monster girls'. It was definitely some kind of fetish thing for online weirdos, but Haruhi was intrigued nonetheless. She went to the site and saw tons of different designs, but the one that stuck out the most was a blue-skinned succubus. The art was really well drawn, and there was just something cool about it.

Haruhi's eyes drifted over to the make-up kit she kept in the club room, and spent the next half hour making her face the exact shade of blue as the drawing, while at the same time trying to replicate the sexy seductress make-up job the monster had.

As she worked on that, without her noticing, the blue from the make-up began spreading into her skin, from her face down to the rest if her body. Haruhi's already well-sized breasts jumped up in cup sizes until they were at least as large as Mikuru's, and her shapely butt expanded until it was fully heart-shaped. Just above said butt a tail ending with a spade grew out, and her fingernails became longer and sharper, dangerous.

It was only when she'd finished with her face, marvelling at how well it had come together, that she noticed the blue skin on her hands. At first she thought she'd gotten the make-up on her hands by accident, but then she looked closer, then down at the rest of her body, and saw she'd truly become a succubus.