He's not sure if he should...and someone interrupts him

Adam was in seventh heaven. It was like he was living a dream as the intense pleasure coming from his cock intermixed with the knowledge of who he was inside of. Alice's experience was in some ways opposite, and some ways the same. She felt such a massive sense of pure horror at the situation she was in that it was hard for her to believe that it was actually happening. The one detail that convinced her that it was, was that even though she hated everything that had happened to her, and was still happening to her, her body seemed not to agree with her assessment. Every time her brother plunged inside, her nerve endings lit up like the fourth of July. Adam's cock was at just the right angle to slide against her clit, while pounding away at her g-spot. She shut her eyes tightly, trying to fight against the intense feeling of warmth that was radiating up from her stomach, filling her with an electric glow. She couldn't help but whimper in time to his thrusts, each whimper coming closer and closer to a moan.

Chloe was having a blast, as she had begun to commentate on her live stream. She stuck her phone in for an **** close-up of Adam's cock delving into Alice's pussy over and over again.

"As you can see, we have confirmation of Alice here, getting absolutely pounded by her brother's cock. Full-on ****, folks. Enjoy." She looked down and noticed that there were now 550 people watching. Her most popular live stream yet! Word must have gotten around already about Alice and more people had downloaded the app.

Rachel was seated in a chair, her eyes glued to the siblings. She licked her lips and snuck her hand into her panties. The culmination of her plan had her so hot and bothered that she couldn't stand it anymore. She pressed down on her clit, getting an immediate wave of pleasure as she focused on Alice's despairing sobs and tear-streaked face.

Wait a minute....were those sobs sounding more and more....pleasurable? Rachel realized that Alice was getting turned on against her will. As Adam lowered his head to begin sucking on his sister's nipple, Rachel began rubbing herself a little harder.

"Oh fuck yes, I'm gonna fucking cum!", she thought.

Alice was reaching the point of no return. The sounds she was making had turned into **** moans.

"Ugh! ugh! ugh! ugh!" she uttered, in time with Adams's thrusts. The additional stimulation of his tongue on her nipple was making her start to see a red haze.

"Oh God, please. If anything could go right for me tonight, please don't let me cum all over my brother's cock while he's fucking me!", she thought. "That would be the worst humiliation yet!" Almost as soon as she had this thought, she felt herself start to go over the edge. She grabbed on to Brady and Devon's arms with an iron grip as she arched her back and opened her mouth with a silent moan.

Adam was having the literal time of his life, but there was one question constantly nagging at his mind. Should he cum inside his sister? He had already done so many terrible things to someone that he loved more than anyone in the world. To fill her with his cum and potentially get her pregnant seemed overly cruel. But he couldn't stop thinking about how fucking good it would feel to do it. He was considering pulling out, when he felt Alice go rigid underneath him and a warm gush flooded around his cock, soaking it in her juices.

"Oh shit, she just came all over my cock! It's gonna be too late, I don't think I'm gonna make it. OH GOD, I'M GONNA..."

Suddenly, a voice from the door to the classroom interrupted. "What in the hell is going on here!?"

Luckily for Alice, Adam shot up out of his sister with a popping noise as he stared, wide-eyed with guilt at the person standing in the door. Alice noticed that Devon and Brady had let go of her, so she propped herself up on her hands, shaking her head and looking up to see her brother's twitching cock pointed directly at her. Adam's cock let loose with a thick rope of cum that splashed on Alice all the way from her navel to the middle of her tits. She had time to process that this was pretty gross, but it could have been worse, before a second stream shot out of his cock, hitting her above her left eye, down to her chin, some of which landed in her partially open mouth.