Yes after doing some tests to confirm the theory

Mark was the inquisitive type he wouldn't rest till he confirmed for himself all the facts. For his friends it made him slightly insufferable as he had a bad habit of investigating so heavily he got into people's privacy. He thought about it, 'What happened? We kissed Myra came, Patty left and... Myra got on my case and I went to my room... so what happened?' he knew there was no way for a person to suddenly grow tits like Chelsea's in just a few seconds... 'Wait a minute,' he began to remember, 'When we kissed I thought it'd be nice for her to have boobs like Chelsea Charms did!' he remembered, when Patty had pressed down on him he had felt her chest which was flat... but did he really do that? He wondered then remembered something, he had done the same thing with his sister before he went upstairs if he really ha been the cause then by that logic she too should be changed. He got up and opened the door he went to the stairs his sister wasn't there, he went to her room and saw it was open ajar, he peeked in and saw her at the mirror of her room. She was grabbing her chest and turning her body around to look at her butt which was definitely bigger than before.

He pulled away hand on his chin if it was truly his doing... then that meant he had to do a test to truly confirm it. He went back to his room and closed the door locking it up, he then went to his full body mirror and grabbed is pants pulling them off. He looked at his dick, small and pathetic. He then thought hard, 'My dick is 14 inches long and 3 inches thick while soft and my balls are the size of basketballs' he thought. He felt a stinging headache and his vision blurred he staggered at the pain but endured it. His headache faded and no sooner had it done so then he began to feel a stirring in his groin. He looked down and gaped as he saw his dick slowly start to grow bigger and bigger a reach down revealed his groin also growing bigger. "Oh holy shit!" he said, he began to get excited, "This is so cool,he looked at the mirror again and watched his dick slow down in growth but his balls kept growing and growing... and as they did he began to feel the weight of them on his legs. He gritted his teeth as they finally slowed then stopped.

"Ok maybe basketball was a bit too big, but if I can change that maybe I can change my muscles too." he said, and thought, 'My muscles are bigger and stronger.' he had a rough mental image of what his muscles should look like. Again the headache but not as intense as the previous, he felt the weight on his legs fade though there was still a weight on his groin. He opened his eyes and saw his body was definitely more muscular than before, it wasn't exceedingly muscular but just enough to be called toned. 'Phew that's better.' he thought he then looked at his balls "Damn they must be packed to the brim with sperm... I wonder... how much I shoot out..." he wondered tempted to see...