Evaluating the options

Mark thought. This was a tough decision. First of all, Sarah is into girls. Plus, they met not too long ago and she is kinda young. Yes, she is three years older than him, but Mark is into older women. Such as his teacher, Ms. Bower. She was one fine woman and the source of many wet dreams of his. Perhaps she would be a better choice. After all, his school year was almost over and then he would go to college. Just then, he thought of something. "Hmm, didn't I forget something?"

Claire slowly regained conscience. Never in her life had she been fucked so good. The way his giant rod felt in her womb, pushing forwarts, seeminly never ending. This was it. She would never be able to feel anything other than her brothers penis ever again. She then sat and looked down. Woah. Whom ever these giant jugs belonged to, they were quite lucky. Wait... why were they attached to her body. She began to shriek.

A sudden, loud scream behind him threw Mark out of his thoughts. He turned around to see Claire being absolutely freaked out about her new body. "Calm down sis" He said as he rushed over to her. "Mark?! What did you do?" "Nothing. Why are you freaking out like that?" "Becaus my chest just jumped up at least ten sizes. It's GIGANTIC" "And? What's your problem? You just had sex with your brother without his consent and what you're worried about is the size of you tits?" That would problaby get to her. If he would continue, he could problaby blame her pregnancy on herself instead of him. On the other side, it would be freeing to have someone to talk about with about his newfound powers.