Don't own Big Bang Theory, another 100 ways to kill a doctor but I sort of cheated.
Sheldon's fangs sank once again into Penny's neck for the fourth time this week, she moaned as long thin fingers trailed between her legs as another hand held her chin at an angle. She felt her essence transfer out of her body to her sire, arching herself to let the teeth sink deeper. Every time it grew more addictive, more intoxicating. She wanted more, needed more.
The bite released and Penny felt a lose and gave a hiss, as the hand between her legs rubbed hard, forcing the fabric of her pants deeper. The hand around her chin dropped to her throat, and gentle squeezed. She could feel Sheldon right by her ear.
"I think it's time you rid yourself of that toy of yours," Sheldon turned her around, his hand still on her throat, "I could make it a command and you can't disobey me."
His eyes were memorizing, as they were when he returned from Europe a few months after Amy had dumped him. She felt compelled to obey, a desire to please Sheldon ran hard and while her bound with Sheldon had been strong before it wasn't the same as with Leonard, at least at first. She was careful not to be hungry around Leonard lest her impulses take over, but she never felt the desire to turn him. Like Sheldon had done to her, she had sought Sheldon out as he hid in his darkened apartment after his return. It was those eyes that pinned her to the wall and to his bed, after several encounters he turned her. And she wasn't unhappy with this change of events. But still, Leonard.
"I…"
A sultry laugh, "Well if you can't, I could certainly do that for you."
Penny turned to Rosa, and hissed. The redheaded woman that had returned with Sheldon, and another reason that Amy was staying away. Rosa bared her fangs in return, the two had a mostly amicable relationship, mainly due to Sheldon. The woman had watched them often, joined on a few occasions. The two glared at each other, Leonard was a sore spot between them, and was the reason she declared she was Sheldon's favorite. Sheldon wanted Leonard gone almost immediately, and Rosa was perfectly willing to do so. As such Leonard never met Rosa, despite the woman living with Sheldon.
Leonard had returned home and found Penny gone again, he sighed and glanced at the door, she was likely over at Sheldon's again. She had explicitly told him not to come over unless she said it was ok, it was likely about that woman Rosa. Leonard shook it off as Penny being jealous. For a moment when Sheldon returned, he felt like saying screw it and meet the woman just to prove Penny wrong, but he had suddenly not wanted to.
He didn't understand it, everything was fine until Sheldon returned with Rosa. Which in itself was a surprise. But soon after Penny disappeared often, had weird sleeping habits and made their apartment perpetually dark. More so, Leonard didn't seem compelled to do anything about it. He was sitting down when the apartment door swung open. He looked up to see Penny walk in, her eyes looked magnificent. Before he could get up, she came over and straddled him, before giving him a kiss.
Leonard breathed it in, this was different and exciting. He did not question this change; his wife was paying attention to him. She wrapped her hands around his neck and back, his hands where all over her back and butt as he tried to wriggle about. Penny brought him closer as she placed her face next to his ear.
He felt a wetness on his cheek, "Goodbye Leonard."
Leonard did not know what to think be for a sudden pain in his neck as he felt something pierce his jugular. Then suddenly he felt no pain and an almost sense of arousal, and very suddenly very weak. He tried to get Penny's attention with his hands but they felt limp, his voice could not speak as he vainly tried to cry out as the wetness on his cheek got wetter.
Penny let go and stood up and backed away from the withered corpse of her former husband. She felt pain and sadness, but more like losing a beloved pet than murdering her husband. She watched as he continued to shrivel and flak before turning to a dust before her eyes. Penny sank to her knees, she knew this should have been harder, this should be affecting her more and she slowly realized Sheldon was right. She belonged to him and she didn't hate it.
Amy had known about Sheldon's return and she had been surprisingly upset at his leaving. More so at hearing about this Rosa, who was this girl anyways. Penny and her had talked a lot when Sheldon returned, and suddenly stopped. And so, it had been a few weeks after Sheldon's return, she decided enough, was enough. She was going to tell Sheldon how she felt and he would drop this flake and take him back. That was all that this girl was, and had likely already bored Sheldon already.
She found herself outside his door and knocked, and knocked again and as she started the third the door opened seemingly on its own. She was confused and turned around and screamed as Sheldon was right behind him. She breathed, trying to relax.
Amy laughed, "Hi Sheldon."
Sheldon just looked at her, his eyes were intoxicating, a small voice, "Sheldon?"
The next moment Sheldon's hand was around her neck and moved her into the apartment and the door shut behind him, and his eyes blazed. Amy felt a sudden paralyzing fear and a palpable rage coming off of Sheldon. Sheldon grabbed the back of her head and pulled it back as his mouth wrapped around her throat. Then the sudden pain that burned like fire through her body as she felt herself go weak. Her eyes blurred as the burning darkness took her.
Amy flailed and tried to scream as Sheldon drained every once from her body, he could feel his own anger. If it wasn't for her, he wouldn't be where he is now. He blamed her as much as his sire, he just wasn't ready to deal with her yet. And then she showed up at his door and he wanted her to suffer, he withheld the aphrodisiac and let her feel the rawness of being drunken.
He felt her hands on his back as Amy crumbled before him, "Master?"
Rosa wrapped her arms around him, before coming to his front. She was his first fledgling after his sire had turned him in such a raw manner. Turning him instead of draining him dry like he just did to Amy. He could hear the apartment door open.
"Sheldon?"
Rosa turned looked over Sheldon's shoulder and reached out a hand to Penny, "Amy came over."
Penny looked at the ashy flesh at Sheldon's feet before placing her arms around him, "Moonpie."
It was a simple matter of removing the left overs of a feeding, but the questions always came. Especially when it is two relatively prominent doctors. So, several things happened over the next few weeks as friends nosed in. The most surprising was when Sheldon turned Priya who had come to visit her brother and started to ask questions as well as threaten to involve the police. Apparently, the darker Sheldon gets turned on by those who challenge him.
Rosa returned to Europe shortly after, as Penny turned out to be really Sheldon's favorite, no hard feelings. Priya returned to India, maybe a bit more spiteful against Sheldon but also inevitably unable to do anything against him. But Penny and Sheldon remained, at least for a while.
After a few more faculty members disappeared the two decided to vanish as well. To keep from having to deal with their close friends more directly. There had been some talk on who to turn and who to enthrall, but they decided to leave Bernadette, Howard, Raj and others alone. It really hurt Penny and Sheldon to leave.
It was a small apartment in Seattle the two had finally found, the two finding jobs and continuing their way of living as best they could. Sheldon hated he couldn't do the things he wanted, though he did publish things under a pen name. However unable to get the type of research he wanted to get done. As such it had been several weeks when they heard a knock on the door and felt something odd.
A man stood outside their door, a car and two men in their driveway. The man was in a suit and had a smile on his face, and something seemed familiar. The man looked at them patiently as they took in what they were seeing.
"Well, you two made a mess of things," He gestured inside, "May I please come in?"
So, there it is, 1500 words of Leonard and Amy being killed with a relationship between Sheldon and Penny. I had an idea of turning more and doing more turning but decided not to. I still wanted Sheldon to have a moment of Dracula and his three brides, so Priya. Rosa was a partial attempt at explaining Sheldon's easy at this, he already had some time as a vampire. Also, the guy at the end is a nod to the World of Darkness/Vampire the Masquerade.