“Enjoying the view, intern?” Austin asked, shifting her labcoat to expose more of her juicy ass, her pussy’s wetness already dripping down her thick thighs. “I know when I called you in I said it was for an experiment, but I have another task for you. You an ass man?”

“Actually, uh...” stammered the intern, distracted by the hypnotizing view of the doctor’s impressive rump. “I dunno. Y-yeah...?”

“Good.” Austin replied, sliding her panties down her legs to expose her bare booty and vagina as she bent over to return to looking down her microscope, her lubricated hole waggling enticingly. “There’s a condom on the table over there. Get over here and fuck me. Just let me know before you cum.”

Doctor Austin had always been a prodigy. Graduating as Valedictorian at an elite private school, he was fast-tracked into an exclusive Science stream and completed his PhD in Experimental Chemistry at 21, even though he was notorious for being a bit of a punk. Hired on a secretive task force at the Transforma Corporation, he was put to work on a military contract trying to find ways to transform soldiers into tall, muscular super-soldiers. However one day, while working late in the lab by himself at night, a machine broke and covered him in an experimental body-change solution. When he awoke the next day he was a complete biological woman. Thinking that this was an incredible step forward, she continued her research with a passion even if she now had tits, female plumbing and a shapely ass. There was just one wrinkle to iron out - subjects exposed to the formula must have sex several times a day or they would temporarily become a brainless slut, unable to focus on anything until drinking a load of cum. Thankfully Transforma had a constant stream of hot young interns who were more than happy to help with this ‘little problem’...

“You call that FUCKING?” Austin complained as she felt the cock leisurely thrust in and out of her, sighing as she reached back and guided the intern’s free hand to her buttcheek. “It’s a pussy, not a delicate flower. You can SPANK ME for fuck’s sake! Now fuck me properly or I’ll find another intern who will!” With renewed vigor the intern grabbed Austin’s hips and began pulling it into his body with every thrust, his balls slapping against her thighs. He was now leaving painful-looking red handprints on Austin’s ass with every one of his spankings, each forcing a moan from the scientist's lips.

After several minutes of passionate sex, the intern’s cock seized up as his instinct to fill her up with his seed filled him, making one final, hard push into the doctor’s hips before filling the condom with his seed. Slowly pulling out as he bathed in post-coital bliss, he began to take off he condom and toss it in the trash when he heard Austin sigh in disappointment. “Ughhh, I told you to warn me before you finished! Never mind... just give me the condom.” Confused, the intern handed the cum-filled condom to Austin who wasted no time in grabbing a straw and beginning to suck it dry, savouring the warm, salty taste. “Well, what are you looking at?” Austin spat, pulling her panties back up as she watched the frozen intern stare with his mouth agape. “You’re not getting paid to fuck around... well, not until tomorrow.”