They need testsubjects.

Slowly Lara’s eyes opened, her halflong blond ponytail shook as she sat up. Letting the grogginess slip away, she noticed she was in a white, round room and apart from a black reflective plate, there was nothing inside it. No, that’s not true, there was a strange bench. “Wait, this can’t be….!?!” Lara whispered as she looked around. “No...no...nononono!!! Where is she? This can’t be…”. Then she felt a hand from behind touching her right boob. Lara veered up like a spring and turned around while stumbling back. There she saw Ginny kneeling at where she just sat. Remembering that Ginny just touched her boob, she looked down and saw she was fully naked and directly tried to cover herself up as good as she possibly could. “P-p-professor!!!! What is happening? Why am I in here?”. No answer, only dark eyes from a frozen looking Ginny staring back at her. “Professor!!! Can you hear me? Please! Why are you doing this? Have I done something wrong?”. Fear really started to build up now.

Lara, seeing no movement coming from Ginny, started to walk towards the edge of the room, looking for something of an exit. Searching the side of the room, making herself a bit smaller so she could check the round edged ground too without showing her nakedness too much, she turned to the side, scaring herself a heart attack, as Ginny suddenly stood next to her. “Yaaaaaaaaaaaaa!!!!!” she yelled as she stumbled backwards and lost balanced on the rounded edged of the chamber. She fell backwards and then rolled over because of the rounding of the floor near the edge of the room.

Breathing heavily as she tried to calm her heart, she lay on her belly on the soft carpet floor. Before she could calm herself though, she felt a heavy body on her back, pinning her to the floor. “O, no! What’s happening?!?” Lara yelled, feeling a pair of breasts poking in her back, warm, moist breathing on her shoulders, her neck getting sniffed at. Then a voice, soft and dark whispered “Ohhh, you are…”. Lara yelled in fear “What? What am I?”. Then it doomed on her “(in the professor's voice) Lara, this might sound strange, but if I’m correct, you are on your period, aren’t you?”.

Without a moment to spare, Lara started to struggle like a wild animal, kicking her legs, trying to buckle, waving her arm, but not long after, she felt a slimy, thick, flexible fleshstick pushing against her closed flower. “NOOOOO! You cannot do this! I can’t….professor!!!.... please…..don’t…..” Lara cried, but without remorse, the appendix slowly **** her dry cunt to give way to it’s invading length. Lara balled her hands to fists and curled her toes while tears ran over her face as she could do nothing than surrender to the rod pushing its way inside her. Slowly her hands toes relaxed as the initial pain had subsided.

Her concentration was completely on the rising feeling of fullness, which came slowly because her body didn’t respond with any heat, keeping get cunt dry. After a while she tried to get comfortable, but her body and mind rejected her pleas to make the invasion a little bit more comfortable for her. The thickness of the member making its way inside her didn’t help either. So there she laid, naked, ass up, in submission of an alien invading her to do what it wanted without any way to stop it and not knowing what comes next. Surrendering to her position, she used her right hand to feel the body on top of her and was amazed at the smoothness of the lower back and soft asscheeks of the girl that was once Ginny. She never felt another girl before.

Her thoughts were broken by a pinch of pain when the tip of the fat rod inside **** its way past her cervix. Then Ginny pulled her body off the ground and on her knees, pulling Lara’s body with her until the blonde was on her hands and knees too. Then Lara felt a strange motion flow through her cunt, something like a wave. Lara knew what this was. The dick inside her made wave motions to suck out her eggs.

“Uuuhhnnn”.... Lara eyes opened surprised when she heard a moan rolling over her lips. Fuck, this was turning her on. She seriously got wet from an alien rod making suction motions to pull out her eggs. “Fuck…..me…” she moaned as her eyes rolled up when the rolling motion massaged her clit. Slowly her knees slid outwards and her upper body sank onto her elbows. The professor smiled as his assistant slowly started to moan on a regular base, giving in to the treatment and letting the alien have its way.

“In the end, humans are weak to primal needs. She will make a perfect testsubject. Thank you for all your hard work, my dear Lara. Now we only need your body.” he softly said. In the meanwhile Lara’s mind was only on the neverending itch between her legs, that slowly edged and then exploded, making her scream out loud as the sight of her eyes turned to white noise. Her breathing stocked, not easily returning to anything resembling normal as the sucking kept on going relentlessly. Lara started to beg “P-p-please…..give me….a f-few sec...onds to recover….” but both the sucking and thus the stimulation kept on going, making Lara moan deeply.

“AAAAAAAAAAAAAAAAAAAHHHNNNNNNN!!! Too much!!!!!! Haaaaaa!!! Haaaaaa!!! Haaaaaaa!!! Please!!! Give me relieve!!!” and again her breath stocked and her eyes rolled back as another mind consuming orgasm hit her. The relentlessness from the constant grinding on her sensitive spots started to make her drool as her muscles holding her up started to spasm. Even when the tone if her moans started to become highly irregular, the pumping didn’t relent.

“OooOooooooOOOOwwwww, F...uuUUU….OOooooOOOOOO….AaaaaAAAA…..nnnnnnNNNNooo….FFFFFFFUUUUUUUU….AAAAAAAAA…….aaaaaaAAAAAaaaaAaa. Hhhhhhnnnnnnn, hhhhnnnnnnnnnnn, hnnnnnnnnnnnAAAAAAAAAAAAAAAAAAAAA!!!!!!!”. Her cunt was continuously contracting around the pumping rod, trying to get it to release sperm inside the now overworked body. As even her next orgasm couldn’t help getting that to happen, a positive thing was that an egg was dropped by Lara’s ovaries and was sucked up her cunt.

When the egg was safely transported and was attacked by the seed inside Ginny, the rod was pulled from Lara’s oversensitive slit. While fully lubed now, Lara’s body had a hard time with the retraction, her cunt spasming and her body shaking with every inch sliding out of her, another orgasm washing over her before the last bit of rod left her hole. Lara broke down the next instant, trying to hold down to her sanity. Her cunt was on fire, super wet. Her body had the workout of its life. She would just love it if she could take a nap then and there.