Getting rid of the competition.
"Step-sister spots something small - on closer look is amazed to find it's her little step-brother who has gotten shrunk and is now tiny and helpless. Sympathetic: how terrifying it must have been to be so small! He could have easily been stepped on by someone!

You realize that this is the perfect opportunity to secretly get rid of your competition. Big step-sis could literally lift up her screaming, pleading, wiggling little step-brother and do the utterly unthinkable: lower him into his own step-sister's big, wet, hungry mouth and swallow him ALIV...

Getting rid of the competition.
"Step-sister spots something small - on closer look is amazed to find it's her little step-brother who has gotten shrunk and is now tiny and helpless. Sympathetic: how terrifying it must have been to be so small! He could have easily been stepped on by someone!

You realize that this is the perfect opportunity to secretly get rid of your competition. Big step-sis could literally lift up her screaming, pleading, wiggling little step-brother and do the utterly unthinkable: lower him into his own step-sister's big, wet, hungry mouth and swallow him ALIVE! Trapped in your belly until he's gone, absorbed into your body... and then his step-sister would forget all about him and expel his skeleton out down the toilet; there will be no trace of him.

Maria licks her lips. Step-mom and step-dad would be so upset to know his step-son's final moments were spent in his step-sister's wet mouth, pleading not to slip over the edge.

**If possible - maybe your partner could do some voice over again: 'please big step-sister. I love you. Please don't so this. Please don't swallow me alive. OMG, your mouth is terrifying!', etc. You're licking your lips, biting on them; your mouth is dripping saliva as your step-brother peers into his fate. You're shocked by how all of it, the screaming, the squirming, is turning you on; it has made you drench your panties with how wet you are. So you proceed to masturbate - and cum when you finally swallow your prey.

**In-mouth voice over is about your poor step-brother screaming, his step-sister's tonsils look terrifying as he slides closer and closer to the edge, unable to grip on. What a heartless big step-sister you are. How intense it is to feel your own step-brother, struggling while also pleading, begging his big step-sister not to take his life... as she masturbates her pussy. How naughty it is to swallow your own step-brother alive.

Trapped inside his giant step-sister's belly, he can plead all he wants but there's no escaping. No more competition between you two. You're on the top of the food chain; you won. Your step-brother's fate: to have his skeleton squeezed out his sisters ass and carelessly discarded and dumped out into the toilet."

A custom clip . No names mentioned x