QA of course!

With my cock in my hand and my pants and underwear around my knees I almost fall out of my chair as try to turn around. A strong hand both keeps me from toppling and pins me to the chair as I spin around to face the back workstation.

But instead of the table laden with books to repair I am staring straight at the biggest pair of breasts I have ever seen. They are huge and seem to defy gravity they way they are perky in a seemingly unnatural way. I unconsciously lick my lips staring at the dark red nipples capping the smooth grey flesh. Wait what!? Grey skin? Dark red nipples?

I look properly and see that a woman taller than my own 6'2" is holding me against the chair. She has smooth grey skin with black tattoos running all over her body in hard to follow shapes and patterns. My eyes keep getting distracted by her huge breasts, wide hips, what looks like an incredible big ass, long legs, dripping wet pussy, a model gorgeous face with pointed ears, shiny black horns, and long red hair fanned out behind her and moving to some unnatural breeze.

I gulp as she smiles at me, showing me her vampiric looking canines. "Umm, what...who... what's going on?"

She looks down at my cock and licks her lips with a very long tongue as I subconsciously slowly jack myself off, "I'm one of the Custom Girls! game developers. I'm in QA and wanted to check up on you since you are one of the first people to get this app. You can call me Jen since you wouldn't be able to pronounce my real name."

She pauses to take a deep breath and exhale with a satisfied smile, "Despite not really doing anything you are just oozing desire and arousal. I might do something nice for you tonight. First, can you guess what I am?"

I take a deep breath but all that does is ramp up my already high arousal as I keep masturbating, "Umm, I think you're a succubus. I just don't know if you're the eat my soul kind, the suck me dry until I die kind, or the feed on sexual energies kind. I'm really hoping you're the last kind."

"Ooh, very good! I'm the last kind, which by the way is the only kind. All the stories about soul sucking and killing are made up by prudes who don't know how to have a good time." She looks down and licks her lips again, "Anyways, we figured out that while we can get energy from fucking humans we can actually get more energy by helping humans fuck other humans. And by fuck I mean that in the broadest sense. Literal fucking is the icing on the cake that's made from arousal. The more human arousal the more natural energy we get. So by sending your braless friend bouncing around out there with an ass that is making her dress flare out far more than usual she is stirring up delicious arousal in her wake. That's what we want from you with the app."

With the rather **** arousal my brain is functioning only because I am used to working while horny, "So you want me to use your app to cause as much arousal to as many people as possible?" I ask with a huge grin, my perverted mind already spinning out scenarios in my head. Working in a college library surrounded by lots of naturally horny young adults is prime ground for this sort of thing.

Jen flexes her hand, her obsidian black claws not quite breaking my skin, "Ooh yeah, those thoughts and more! I knew you would be a good choice! Some of us didn't think you would be after you spent your first 20 gems sexifying your friend and then letting her leave."

Even masturbating next to a succubus oozing pheromones or sex waves or whatever I still kept at least a little part of my brain, "She's my best friend and I don't want that to change, even with this app. Did you see how happy she was with the changes? And how hot she is? Besides, with her helping me you'll probably get more energy. Also, I honestly think she's a bigger pervert than I am." Thinking about her makes me see her bent over with her ass in my face and breasts hanging out and I start jacking off faster.

Jen looks up and sniffs the air again, "You know, you just might be right about her being a bigger pervert than you. I have high hopes for you! Both of you! I'm going to add a little something to your app now and another surprise tonight. If you play your cards right with it you might get your hot friend to want to add "with benefits" to the friendship. For now I'll give you a few gems to play with. It's still the middle of the afternoon, lots of time to play." My phone dings three times so presumably I have three gems.

"One more thing, double or nothing on those free gems. What naughty fun thing do you think your little sex Captain is doing right now?"

Without thinking I blurt out the first thing that comes to mind, "Flashing somebody her new boobs or ass. No, probably trying to see up a skirt or down a blouse!"

Jen chuckles as I hear six more dings. She hands me my phone as the CG app shows me a live feed of Kathryn bent over at the waist with her skirt riding high showing off her new ass. A mixed gender group of college students is trying to study but instead they are all staring raptly. None of them notice Kathryn's head tilting to get a view up a leggy blonde's very short jeans skirt.

With a sensual laugh Jen fades from view while dragging her claws on my thighs. With that and the image of Kathryn bent over I shoot my load high in the air where it splatters on the empty ground in front of the workstation.