Outside the school, you saw a hundred Sarahs, all totally naked, stood looking at you.
"It's no use running," they all said in unison. "I'm omnipotent. I can do whatever I want."
"Get away from me!" You shouted at her/them, and barged through the crowd, resulting in your cock growing hard from all the nude flesh. You started to head home, and got on a public bus, one of which had just pulled up at the nearby bus stop.
"Where ya headed, sweetie?" You heard a familiar voice ask. You looked up, and realised that the driver had been replaced by a naked Sarah. "Oh, and clothes are banned on this bus."
Instantly, you were naked, revealing your boner to all the passengers. Wait, you turned, and saw that all the passengers were in fact naked Sarahs. You turned to leave the bus, but the doors were already shut, and the bus had set off.
"Where's the rush?" Sarah asked. "Stay a while. Take a seat." Suddenly you felt your legs move against your will, and sat you down on one of the bus seats, in between the two remaining Sarahs. They started stroking your naked skin, and your dick became impossibly hard, feeling like it would cum at any second.
"I don't know why you want to leave me," one of the Sarahs said. "After all, I'm omnipotent."
"I can make you so happy..." said the second Sarah, before kissing you passionately.
The instant your lips touched, you felt your dick explode in pleasure, blasting out your semen in the most powerful orgasm of your life. You moaned into Sarah's mouth, as she just kissed you more passionately.
"My my, you're making quite the mess," the other Sarah said. "Let me take care of that." The second Sarah then moved her head down, and began sucking on your dick, which caused your orgasm to intensify, as she swallowed your endless load.
On the one hand, this was a nightmare. Your ex-girlfriend had replaced everyone on Earth with a copy of herself, and was basically forcing you to make-out with her. On the other hand, this was a dream come true! Your ex-girlfriend had become omnipotent, and rather than punish you with her infinite powers, she seemed to just want to get back together with you, and you had to admit, the feeling in your groin and lips right now was the greatest thing ever.
Eventually Sarah moved both bodies off of you, and you stopped orgasming, though your dick still stayed impossibly hard, feeling right on the edge of climax.
"We're here sweetie," Sarah said to you, as she returned to only one body. She took your hand, and pulled you up, her touch making your dick feel even closer to the point of no return.
"Thanks for the ride," she said to the driver, and you realised that Sarah seemed to have restored everyone else on Earth. You felt a little embarrassed that everyone could see you naked, but Sarah seemed unconcerned, and she led you off the bus.