Karyn opened her eyes and smiled. "Hi, Jon," she cooed.
Oh, I'm gonna have loads of fun with this, Jon thought. He pulled back the covers, exposing Karyn's naked body and immediately said "Bounce," before he even noticed that Karyn's breasts weren't already twice their size, as per his wish.
"Hey," Jon said. "How come ..." He stopped when he felt something on his chest. He looked down at two mounds of flesh, which were obviously breasts. A-cup breasts, but breasts nonetheless. He touched one of them and felt a jolt of incredible pleasure run through his body. I'm so sensitive, he thought.
"Wow, how'd you do that?" Karyn asked.
"All I said was 'bounce' and ..." Jon stopped again, as he felt the weight on his chest grow. There was a reason for that. He now had B-cup breasts! He didn't know how it was possible, but the wishes he made for Karyn were affecting him.