Amy

"Amy - where have you been? Look, we don't have time to argue any more. Untie me NOW. Please!!"

"You yelled at me to get out. That was rude. You scared me."

"I'm sorry. I didn't want you to see... I mean I wanted to be left alone for a bit."

"Why?"

"Amy, not now! Just untie me."

"Did you cum again? Like you did to start with?"

"We are NOT talking about this now! Untie me!"

You can't believe her attitude. She seems to have no fear of you, only curiosity.

Even more, you can't believe what she does next. She extends a small hand and grasps the crotchrope as it runs down your belly. The simple act of slipping her hand under it makes it tighten and almost pushes you over the edge.

"Ahhh.. Amy! Don't do that. Letgoletgoletgo. Please..."

You daren't move. And if she pulls on the rope...

"I want to talk about it. Go and lie on the bed, or I'll pull it."

"I-I can't. You'll have to let go. Ohhh.. Please, let go..."

"OK, but if you don't do what I say I'll pull it again."

She releases the rope. Your burn with shame. You're being ordered around by your kid sister. But what can you do? If you annoy her all she's got to do is to pull on your crotchrope. She's obviously picked up that the rope was the cause of all your struggling and moaning. You won't be able to stop her, and the result will be you orgasming in front of her.

Moving carefully, you sit on the edge of your bed, then lie down.

"Put one foot over each side of the bed."

You look at her, then move your feet apart.

"Wider! So you can get your feet on the floor."

You don't like this, but your spread your legs until your knees are hooked over the edges of the mattress and your feet almost touching the floor.

"Now stay there. If you don't I'll pull the rope."

Amy's brought up one of the pieces of rope that she'd used on your legs earlier. Deftly she ties one end to your left ankle, passes the rope under the bed and ties your right ankle. Still shaky from your orgasm, you don't have the strength to resist. You lie on your bound hands with your legs spread obscenely.

"W-what are you doing? Amy, no! Untie me. Please untie me."

"No! I want to do something"

"Something? What do you mean?"

You start to struggle, but a jolt from between your legs quickly stops you.

She ignores you and walks over to your wardrobe. Opens the bottom drawer. Moves the shirts that are inside.

"AMY! Don't. Don't you go in there. It's private. Amy - get out!!"

She straightens up and extends her hand.

"Look what we have here?"

She's holding your vibrator.

"I think we should find out how this works, don't you?"