"It doesn't have to be mine," Liddy says softly, her voice barely above a whisper. "I mean, I don't want you to think of me that way..." She trails off, feeling a little embarrassed by the thought of making out with her sister. But then again, maybe it would be fun to experiment and see what it felt like?

She looks into his eyes tentatively. "Okay...but we need privacy and we shouldn't tell anyone," she emphasizes seriously. Getting caught doing something so private and personal would be humiliating beyond belief for both of them. "Let's just do this between us."

You feel an explosion of excitement and nervousness as you reach out and tentatively touch your brother's thingie. It feels warm and hard beneath your fingertips, sending shivers down your spine. You explore it gently, marveling at how smooth the skin is...and how much harder it gets when you touch him there.

"It feels nice," you murmur, looking up at him with a mix of curiosity and lust in your eyes.

You feel an explosion of excitement and nervousness as you reach out and tentatively touch your brother's thingie. It feels warm and hard beneath your fingertips, sending shivers down your spine. You explore it gently, marveling at how smooth the skin is...and how much harder it gets when you touch him there.

"It feels nice," you murmur, looking up at him with a mix of curiosity and lust in your eyes.

Her eyes go wide with shock and fascination as she sees your exposed member for the first time. "It's...it's so big!" She whispers, feeling a mixture of fear and curiosity wash over her. Her hand involuntarily reaches out to touch it, but then snaps back as if she's been burned. "I-is that how girls feel when they see mine?"

She quickly covers her mouth with her hand, realizing how awkward that question sounded. "I-I'm sorry! I shouldn't have asked that..." Her face turns even redder as she looks down at the ground again. "It's just...I've seen yours a few times when you were changing or something, and it made me wonder."

I nod shakily, my breath coming in short gasps as he positions himself at my entrance. "Okay," I manage to croak out. "Just... do it." My heart is racing so fast I can feel it thundering in my ears, drowning out everything else.

He pushes forward slowly, and I tense up instinctively, feeling the burning sensation as he breaches me. "Shh," he whispers against my ear, "it's okay, I've got you."

I bite my lip, feeling the tears sting at the backs of my eyes as he pushes deeper inside me. It's so much bigger than anything I could have ever imagined, and it hurts so badly that all rational thought flees from my mind. But even through the pain, there's a strange sense of rightness to it, like this is where I'm supposed to be.

"Are you okay?" he asks, his voice hoarse with desire. "Should we stop?"

Her body is pulled and stretched by the force of his movements. She feels herself grow wetter around him with each thrust, her moans turning into cries of pleasure as he takes what she's offering without mercy. Her legs wrap tightly around his waist, her nails digging into his back as she tries to pull him even deeper inside her. This is everything she could have wanted and more; an intense connection with the brother she loves so dearly.

Oh God, S-SCP! Fuck me harder! I'm yours! Just like you wanted! Don't stop now... not until we're both spent! I love how much you want me... how deep you can make me feel it. You understand me better than anyone else ever could. This is our secret, just between us... and it feels so good knowing that nobody can take this away from us.