Reach behind you

You reach behind yourself with your arm and wrap your arm around the back of her head. Martha smiles and leans in. Her grip around the front of your neck gets tighter still. It's getting difficult to breathe now. Her fingers resting on your waistband begin moving. Slowly she pulls on the waistband, inching it down. She slips your underwear off and pulls them down. Then she grasps your hip once again, this time without the fabric of your underwear blocking her grasp. She holds you tight, clutching the flesh of your ass.

"Fuck."

She breathes out.

Her fingertips dig into your neck. You feel a throbbing in her cock against you as she begins grinding it slowly into your soft ass cheek. Her lips are by your ear now. You hear a soft moan from her.

"Mmmmh"

"Be quiet..."

Her hand, firmly around your throat, loosens a little and her other hand lets go of your waist. There is some fumbling behind yourself. She's stroking herself.

"Be quiet."

"Just be a good boy... be quiet."

Her fingers now slide down between your ass cheeks, and one finger is gently pressed up between them, probing. She moves her finger down and you feel it find your hole.

"Shhhh"

Her fingertip presses itself against your hole, softly, rubbing small, circular motions. You can't help but exhale sharply at the feeling. Her grip around the front of your neck, which had loosened, suddenly gets tight, crushing against your windpipe.

Her finger, pressed up against your asshole, applies gentle, increasing pressure.

"Such a good step-brother..."

You feel the finger pressing inwards. Your face feels very hot, and your mind is blank.

"Oh... you've never had something in here have you? Your body feels so tense, so stiff... relax a little more, okay, dear? Cuddle with me, remember? That's right. Be a good boy."

Martha takes a slow breath.

"I'm going to try to find something inside of you that's going to make this cuddle a lot better... you stay nice and quiet though okay?"

Her fingernail begins pushing deeper, gradually. You can feel your skin slowly giving way. Martha keeps it's progress very slow, allowing you to feel every subtle sensation. Her finger presses gently upwards towards your belly, stroking a spot.

"What do we have here?"

You let out a small moan, without even realizing. A moment later, Martha's hand squeezes your throat even harder.

"Shh..."

Her fingertip makes circular strokes around that spot inside of you. She knows exactly where it is.

"Does that feel good?"

You can only nod, silently.

"Tell your step-sis how that feels. Tell your step-sister."