Finish her off

You stop kissing her, but keep you body on top of her, ready to tackle her if she tries anything. She squirms beneath your pillar which hurts and feels like its about to jump off, probably into your sister's soaking sex.

You laugh when you look at her soaked thong. You say, "Slut, I bet you've wanted this a long time. Look at how wet you are." You stick two fingers inside her slit, her lips greedily sucking you in. You manage to yank your fingers out and present them to her. Blushing, she moves her cheek, refusing to look at her arousal. She mutters, "No, no, no. This can't be happening you're my brother. I can't be this ****." You grab her chin and tilt her head towards your wet fingers.

She pushes you off, and you roll over, sensing that she won't try to make a break for it. You want her to make the choice on her own, so that at the end of the day, she'll remember that she wanted to be your bitch in heat. She waves her vibrator like a sword between you, her pussy juices running down it. Her voice wavers, "Stay, stay away. I don't want this."

You knock her paltry barrier to the side, and she seems to gasp in shock. She covers her breasts and pussy, suddenly realizing how open she is to you. You wish you'd snapped a photo on your phone before you'd come in. Oh well, with magic, you'd surely get more chances. Her body's quivering, shaking, the arousal spell must be truly powerful. Realizing your position of power, you grab her dildo, you're surprised by how slippery it is. You glance down, feeling a wet spot around the groin area of your pants. You smirk. "You sure you want me to go away, slut? You've got my pants all dirty... I think you should have to clean them, but if you don't want to..."

She practically yells, "No, please fuck me," before realizing what she had asked for and muttering, " Please go away , Big Mac. This isn't supposed to happen."

You chuckle. "Someone's a bitch in heat... can't even think straight.. your pussies making a mess... I think you have to do something, but since you're my sis I'll let you off easy."

Tossing her dildo to the side, you yank her up by her arms and tackle her against the wall. She mewls, and her nipples drill through your shirt. Her arms held above her head, she begins dry humping against you. You sigh. "I'm disappointed in you, slut. I thought you'd be more of a challenge... and less of this **** bitch shit." You let her go, letting her drop to the floor, her face level with your tent.

She babbles, "Please, please, let me clean you, Big Mac. Please don't leave me here."

You question, "I thought you didn't want to fuck though?"

She looks confused. "... I guess.... but we can still do other stuff right? I could help you clean your pants and be a good sister."

Internally you curse, she wasn't quite **** enough yet. You turn and nonchalantly stroll towards the door, when she lunges at you from the floor. Gripping your leg, she whimpers, dry humping her naked pussy against your foot, panties still tangled around her knees. She begs, "Let me show you what I can do."

You sigh, even though inside you feel like you're on the moon. Sitting down on the bed, you watch as she slowly crawls over to you, her panties and pussy leaving a wet trail on the white carpet behind her.

She gently licks the crotch area of your PJs.

You whisper to her, "Mmhm... slut, lick it. I know you want to. Why don't you just lick your pussy juices while your big brother watches." You run your fingers through her long flowing hair as she nuzzles the cloth over your crotch.

Feeling a bit of stickiness on your hand, you remember that you stuck your fingers in her pussy.