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Sarah notices your crotch and licks her lips. "So my big brothers a masochist huh" she says stroking her cock that's already starting to get hard again.

"If sucking me off got you that hard I wonder what would happen if I took you from behind." She said gesturing to the (small in comparison) cock between your legs.

"S-sarah, we need to stop. I can't do this." You say gazing longingly at her futa stick. A part of your mind shivers even thinking about taking that monster, before you shudder back to reality and realize you need to pull yourself away, fast.

Surprisingly you get to your feet before she does, unsurprisingly your body is too numb to make it out the door and you collapse back on your knees ass raised straight at her.

You watch as she steps over you, closes the door, and locks it while smirking at you. "You didn't think that was gonna work, right?" She taunts. You feel her spin you around with the strength of a beast and position herself neatly between your ass.

Realizing her intentions you kick and scream in protest "No! No way is that going in me, it's not gonna fit." You felt her squeeze your throat, shutting you up instantly "there there big bro, don't worry. ILL MAKE IT FIT." She said as she ripped a hole in your pants and buried her cock deep inside you.

As your sister rearranged your guts you felt your cock stiffen against the floor. She smirked in delight and started to thrust now.

Every thrust sent a tingle down your spine.

Your cock slammed uselessly against the floor with every slam of her hips

You felt the ache slowly drift to pleasure

You were now leaking more than her

You were made for this, the perfect toy

Each time she bottomed out you felt your mind slip away

With one good slam you felt yourself explode against the floor, a handsfree orgasm. The kind only absolute sluts get, but against her cock you were nothing.

"Good boy." She said teasingly "that's how toys like you are supposed to cum."she pet your head gently

Still she kept going.Trust after thrust for ages. Eventually the pleasure turned back to pained throbbing, and then back to pleasure as you were molded into a good cum slut

And still the thrusting continued. Eventually you felt a nice warm load fill you up but she didn't seem satisfied, immediately jumping back on you and riding you like the bitch in heat you are.

Honestly you could've been there for hours, you heard your mom and big sister come home but your sister just said you fell asleep early and kept using you.by the time she finally let you go you were so covered in her semen you thought it might stain your skin.

But now you were changed, you knew your place. Wrapped around Sarah's cock.