Adam starts to the issue

The pill overdose heavily influenced his behavior and changed his way of thinking. His sexual morals were gone. His self-control was gone. All he wanted was to fuck this hot girl, his sister. To finally lose his virginity, to experience sex for the first time, to get pleasure for his cock. His cock did all the thinking, his cock was all that mattered. Because of that Adam no longer understood what Sarah meant, what being her brother had to do with anything.

"Yes, i am your brother. And i have a huge boner that needs a pussy. I will use you to become a man, Sarah."

With that Adam began to rock his hips back and forth, fucking Sarah's tits with his angry cock-head. On the down movement it disappeared below her tits, on the up movement it reappeared. Pre-cum continued to flow out of Adam's slit and smeared her cheerleader top and cleavage. It's scent continued to arouse and intoxicate her. The friction on her sensitive breasts gave her pleasure. Her erect nipples could be seen poking through the fabric.

"But i'm your sister." Sarah whimpered and moaned, her mouth wide open.

"Yes Sarah, until now you were just my sister. Now you will become more. You are very lucky, because you will be my first. The first girl to pleasure my new big cock. You will be my first slut. My cock hungry little slut. My cock hungry sister slut." With that Adam placed his hands on Sarah's shoulders, and started to press her down. Slowly, the tip of his cock came closer to Sarah's mouth.