One-Shot series

Frank appeared normal, he had a cute smile, sparkling eyes and a gorgeous boyfriend. What people didn't know, was he was the man everyone was looking for. They were tracking him down, or they were supposed to. The police department's efforts were futile because frank left no evidence, no fingerprints or hair. He bathed the bodies and sterilized them before dumping them in a forest. It was how Frank got away with it, especially because the victims were at random, attacks that were designed to look personal but they were really just people he saw and watched for weeks before torturing them and ending their life.
Relationships like Frank and Gerard's are typically cursed, Frank could suddenly decide he didn't want Gerard anymore and kill him like any other victim. That was his plan if Gerard didn't agree to help him, be his partner in crime, if you will. Now, what Frank didn't know was Gerard had some very dark, very disturbing fantasies, much like frank's own and he was willing to turn those fantasies into reality.
Frank pushed Gerard down onto the bed, his hands wandering all over Gerard's body as he kissed all over his neck, his kisses were rough and lustful, not stopping for breath, "Gee, Gee... Fuck..." Frank rasped, relishing Gerard's moans as he tore his shirt off, arching his back as he lifted it over his head, giving Gerard an eyeful of soft skin, adorned with Ink and scars, "Gee, I've got something to tell you." Frank purred, catching Gerard's gaze.
"What is it?" His voice was breathy, eyes dark and lustful as he watched the familiar dangerous smirk form on Frank's soft lips.
"I did it, I tortured them and killed them. You understand, don't you? You won't leave me, will you?" Frank breathed, taking Gerard's pale skin between his teeth.
Gerard gasped quietly, letting out a shaky moan, "Fuck, I won't leave you. I understand," He closed his eyes for a second, something lesser bothering him, "You didn't fuck any of them, did you?"
Frank grinned easily at him and kissed him slowly, tangling his hand in Gerard's hair, "Now why would I do that when I have your pretty little ass to fuck?"
~~~~
It was a few days after Frank's confession and they were sat back in the bedroom, cross legged and naked. Frank slowly reached for the knife, smiling up at Gerard dreamily, "Now we seal the deal." He whispered, bringing the knife to Gerard's smooth skin and shushing him when he whimpered, "Blood promise, baby. You understand, don't you?"
The same line was repeated throughout their relationship whenever frank did something different, abnormal. Soon, the cold blade was cutting just underneath Gerard's collarbone and was followed by a moan. The blade then slashed over frank's wrist, making blood seep out of the wound until he pressed it to Gerard's gash, forcing him into a rough kiss as he pushed him down on the bed, smearing the blood over his chest, "Ave Satana." he whispered against Gerard's lips, making Gerard moan again, repeating the translation, "Hail Satan."
~~~~
Gerard was practically shaking with nerves and excitement, rocking on his feet giddily. Frank had ordered him to the warehouse, telling him he had a treat. Gerard could just about hear the muffled screams and the dark laugh emitting from frank, Gerard checked behind him before knocking 6 times on the door which was opened hurriedly, Gerard barely even having time to say "Hi." Before Frank was tugging him inside and kissing him messily. Gerard giggled quietly, hearing the lock click shut. Soon Frank was pulling him into the middle of the warehouse where a young girl was bound to a chair, thrashing and screaming, although they were muffled by the tight gag. Gerard hummed in excitement, nuzzling Frank's neck, "This is the best surprise ever." Gerard whispered, wrapping his arms around Frank innocently.
Gerard was now holding a knife to the girl's skin, looking over at frank who held her head back with her hair. Frank gave him a reassuring smile and Gerard made the first of many cuts, he gathered the blood in the goblet and raised it to his lips, giggling hysterically. He then lent over to kiss frank, leaving blood on his lips before he stated making more cuts, gathering enough blood to make an Inverted Pentagram.
They were almost finished now, all Frank had to do was kill the bitch. They'd cut her up and burnt her skin, bruised her body and had sex in front of her. Frank finally decided to slit her throat, there was blood gushing out of her neck and she was gurgling, screaming in desperation.
"Get your fucking hands up where I can see them!" An angry voice commanded from the doorway, Gerard looked at Frank sadly before sighing, "As we practiced?" He whispered, pulling Frank close. Frank's smile wavered and he kissed Gerard softly, "Put the gun against my temple," he replied, putting his own against Gerard's. Gerard copied his action, squeezing his eyes shut, "I love you."
Frank giggled softly, "I love you too, baby. See you in hell." He purred, kissing Gerard one last time before they both pulled the trigger, collapsing soon after as they let go of life, limbs still tangled together.

Notes

This one's a strange one.......