Aaron got a call from his girlfriend, picking up the phone he heard her say, "hey darling, I'm outside. I know you've been waiting to finally... you know what..."
He remembered that his girlfriend was supposed to be headed home from a vacation upstate. They had been dating for a few weeks and this was supposed to be the day when they fucked. But then Aaron remembered that this was not his normal universe, and he'd be fucking someone with a dick.
He opened the apartment door to let her in. She was still her same cute little self, he definitely wanted to be with her, but not this version of her that had a dick.
She kissed him on the cheek then said, "want to just get straight to it." Still horrified by the though of her having a dick Aaron nodded without thinking. His girlfriend smiled, "great. Let me just use the bathroom then we'll finally do this."
Aaron sat on his bed while waiting for her. He could hear her peeing standing up but tried not to think about it. When she walked out she started undressing, it was hot at first, seeing her smooth skin and perky breasts naked. But then she took off her skirt and her erect penis could be seen. There was something so weird and wrong about it, it was the body he loved but with that part, at least her crotch was still shaven and it wasn't bigger then his.
She looked into his eyes, "do you not like me? I know most men like a girl with a bit of a smaller dick. Or are my boobs to small for you?" She looked so insecure, and for this world she was amazing, he felt so sorry for her.