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Phantom didn't mean to hurt their sister.
They didn't meant to lose their grip on themself and pin Lace down, hearing her guttural cries, watching her writhe and scream underneath them as they pushed her into the floor and mutilated her silk.
But oh, they had always hated how she made them feel. How she would always goad them into that horrible, awful temptation to copulate with their sister, falling into her desires and wishes for intimacy with the only other bug who would speak to her with such endearment.
It was so easy to give in to her and they hated it. They hated how she kissed them so lovingly, how she put her hands inside them, how good she made them feel, how with just enough touches in the right spots and with the right words, Phantom would find themself surrendering to her, letting their mind become overwhelmed with lust and pleasure, their vision blurred with shapes and colors, before all of it ultimately came crashing down into reality, a rot growing in their chest, at what they had done was utterly disgusting and repulsive.
And yet they did it all over again. Phantom's walls would crack and fall under enough pressure. They could never say no to Lace; they couldn't bear to see their sister's face twisted in sadness and melancholy whenever they denied her. And they hated themself for it. Hated how submissive they would become to her.
They hated their sister for it. Hated how she tempted them into this abhorrent and deplorable act. How she could turn their reserved temper into a moaning and shivering mess, send shocks of pleasure through their silk before they could retaliate, rendering them complacent.
They hated all of it, but she made them feel so good.
They could never control themself around her, and still was not in that moment at all, when as Lace was on top of them, pressing her lips to theirs, Phantom suddenly grabbed her wrists and pinned her onto the floor.
"My, aren't you finally the dominant one now?" Lace teased, but then immediately became washed with horror as her sibling pressed their claws down on her wrists so hard that they tore into her silk. She writhed and screamed, but it only made Phantom hold her down harder, their mouth curled into an angry and lustful snarl, their mind swirling.
They then took one hand off, moving the other one to press down on her chest, and slowly dug their claws into her crotch, plucking apart the repeatedly-mended silk as a result of all of their previous dalliances, this time twisting and wrenching it so aggressively that it tore even further into the untouched strands deep within, producing a long, drawn-out shriek from their sister as they laggardly rendered the silk apart enough to create a hole. Their work was not hasty; they wanted her to feel every sensation, every confusing mixture of pain and pleasure shooting through her silk like she had made them feel, every time her fingers tore and wiggled into their own threads. They wanted to hear her sounds like she had earned from them, those cacophony of wild moans and whines that echoed throughout the organ.
Lace grabbed at the arm that held her down, but it was like a steel pole that she could not budge. She pleaded for Phantom to stop, but they did not loosen their hold on her for one bit—did not hiccup a single bit in their motion as they undid her silk. Phantom then pulled their claws out of her. Cold air rushed into the hole, before replaced with a sudden, firm warmth. Phantom released their other hand from her chest, but before she could rise up they grabbed her wrists again and pinned them down next to her head. Lace looked up at Phantom in abject terror—she could not bring herself to look down, at what was happening there, but staring at her sibling's face looming right above hers was no better; she watched as they stared back at her with wild, ghoulish eyes, their mouth letting out loose moans, panting like a wild beast, their mouth curling into a snarl.
I hate you, they snarled, their voice filled with animosity. I hate that you make me feel this way. That you make me feel so good.
And yet, they still indulged. Lace couldn't understand. She tried twisting and turning again but was only met with a tighter squeeze around her wrists, their claws threatening to tear into her again. She then tried to kick, but any resistance was ultimately futile.
Stop moving, they growled, don't make this difficult for me.
A horrible warmth rushed through her silk. Lace was terrified, but, her back still arched, her pleas turned into incomprehensible babbles and moans, her mind still swirling with pleasure as her sibling filled her deeper and deeper, the warmth turning into a fiery heat blossoming throughout her lower body that became greater and greater until she finally reached climax, a mixture of sobbing and screaming and laughter that tore throughout the Exhaust Organ as she squeezed her eyes shut. She wanted to lay on the floor and pass out, but her sibling would not let her; they did not stop their thrusts, until they reached their own climax, letting out a howl as they slowed the motion, pleasure coursing through their own silk.
For a moment, there was nothing but the sounds of heavy breathing that reverberated throughout the Exhaust Organ, and then, the wave of guilt and regret that crashed down upon Phantom as they realized what they had done as their mind returned to clarity. They immediately released their her hands and scooted back from their sister, watching as she laid there in exhaustion, her body violently trembling, the silk between her legs ripped wide open and tangled.
And from that moment on, neither were ever the same again.
Lace believed that she liked it. She still felt all of that pleasure, so she had enjoyed all this, no? She had done the same to them, had she not? It was just another dalliance, was it not? Her sibling had merely lost themself a little, and Lace would be willing to let it pass, if only they weren't acting so strange after that, becoming increasingly cold and distant. It seemed that that little incident was all it took to finally turn Phantom into a steel wall. She didn't think that the moment was as bad as Phantom made it out to be. It did scare her, and yet she still goaded them, wondering if she could one day make them snap again, undo all of that self-restraint and see that other side of them again.
Phantom didn't mean to hurt Lace, the only one who they loved in this world, but they didn't want to admit it; it pained them too much too. I did not do that to you, they told their whenever she tried to bring it up. I did not hurt you like that, because maybe if they believed hard enough themself then the guilt would no longer weigh on their mind so much, but it never did; a rot festered deep within their silk, and they clawed at themself trying to get it out, trying to forget all of this, but it never went away, and every day their mind and body was torn and ravaged with guilt, their chest tightening, unable to breathe, as if they had lungs, every time they remembered that moment that they had utterly violated and desecrated their sister.
They didn't meant to do it. They never meant to hurt their own sister.
But they did, and it would haunt them both for the rest of their miserable lives.