A refridgerator sized tomb rolls into the room...

Translucent blue sedatives flowed through the tubing into Terra's muscles and skull. She felt herself going limp. "Ohhhhh..." Every muscle relaxed, and she hung loosely from her restraints. This didn't make it any easier to remember. Her vision blurred, she had trouble focusing her eyes.
A large, white tomb, big enough for at least Terra, wheeled itself across the floor. It was close enought that Terra could see how heavily locked it was--something was inside that was not supposed to escape under any circumstances. She heard chatter up ahead, but not as much as before--had the others left?

"We've found one other suitable for the project, but the negotiations to get her were difficult." Antoinette spoke casually to Susan, as though none of this bothered her in the slightest. It only accented the concerns of Susan. Antoinette noticed this immediately, and took on an appearance of scorn and embarassment over her lack of what Antoinette might call "professionalism". "She was a soldier of the enemy, and in her mind, she still is the enemy, Susan. Get a hold of yourself."
Susan took a breather. This was a Department of War funded lab, and god knows they had done worse to enemy soldiers. This one might even call herself lucky. War really wasn't Susan's forte, though.
"So who's the counterpart?"
Antoinette was right behind her. She slapped a dermal over one of Susan's veins. Susan realized this, had a moment to panic, and then fell to the floor. "Think of it as an initiation to the cause." Her vision blurred, she slumped over, suddenly felt the cool of the tile against her face, and blacked out.

When she awoke, she was bound up with her enemy, their bodies wrapped together and exposed. She was surprisingly warm and soft. Susan could tell that her pussy had also been shaven, but thankfully there at least weren't any IVs or neural intrusions. Then she saw the box.
Her mouth was too slack to form words anyway, but it was ring-gagged. The knowledge of what was going to happen next made it all that much more horrible. Antoinette, with her finely manicured nails and silky hair, her detatched beauty, stood behind the glass, knowingly. The coffin's latches snapped, and it slid open.
Terra saw a million coiling serpents before her. On closer inspection, she realized they were tendrils, roiling hungrily. They wanted flesh, didn't they? It was no mystery to her what was going to happen now. The bonds that held her and the redhead--Susan--hummed to life, and carried them over the coffin, Susan on top. They were lowered into it slowly, until the tendrils came in contact. They immediately flared to life, and started wrapping around and pulling at their flesh! The restraints loosed up a lot then. They were being pulled in by flesh, not steel.
The orifaces across their bodies were probed at, on the outer edges at first. They both felt it at their eyes--useless in the darkness as it was--ears and nose first; then the corners of their mouths, which were promptly stuffed with twirling sexual terror; then their pussies and anuses, and navels, instigating absolute fear. Everything was invaded at once. They both tried to scream, but couldn't make a sound through the twirling tendrils of lust int their throats. Terra was as confused as she was frightened. Susan only wished she could say the same--the two of them were about to get a lot closer.

All the while, the unknowingly devilish Antoinette watched, wetter all the time. She had been exposed to an experiment herself once, entirely accidentally, and it left a devouring mark on her that the clinic had failed to notice at the time. She lusted after Susan since hours before they even met. She knew. She could feel their tormet, and it egged her on.
Tears streaked down her cheek suddenly. "There is no forgiveness for us, Susan dear." She sniffled, feeling this alien sensation overtaker her. "Only nemesis and consumption."