Ms Fraiser undid your belt, and pulled down your jeans and underwear, exposing your decent-sized, but flaccid cock.
"Guess you're too nervous to get it up," Aly said in your head. "Lemme help you with that." Instantly you felt blood rush into your cock as it shot to full mast.
"This is for being such a good student," Ms Fraiser said. Then before you got a chance to object, your cock was in her mouth, being sucked sloppily.
"That feel good Adam?" Aly asked. You jumped, and saw her sat on a seat right next to you.
"That the..."
"I said does that feel good? The blowjob?"
"Uh...yeah..." This was weird. You were getting a blowjob in class from your teacher while your big sister sat and watched.
"Of course, not as good as Sarah's blowjobs, right?" Aly asked.
"Uh..."
"It wasn't just Sarah's body I altered, I did other things for you too," Aly said. "Like control her mind when she was sucking your cock, so that I could make sure she sucked you right."
"You watched us have sex!?"
"Didn't you ever wonder why you could cum half a dozen times in a night and still shoot and full load and stay hard? That was my gift to you. In fact, once you hit puberty, I commanded that your dick would become the sizeable thing it is now. I'm also the reason you're in good shape despite being incredibly lazy and eating tons of junk food. I altered Sarah's pussy to make sure it was exactly perfect to pleasure you. I made your genitals 100 times as sensitive, and I made your orgasms 100 times as intense. And I made sure you'd never use a condom, because I kept you safe, and wanted to maximise your pleasure."
"I know you're probably mad at me," she continued. "But remember, it was all to help you. To make you feel good. I never forced either of you to do anything you didn't want to. I just heightened the pleasure of the sex you were already gonna have. Like this. Adam, I want you to have a massive orgasm, right....NOW!"
The instant the word left your sister's lips, your cock was already hard at work pumping semen out into your teacher's mouth. It was without a doubt the single greatest orgasm you'd ever experienced, something you felt you had to put down to your sister's powers.
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