An unexpected side effect or maybe something more.

Gwen smirked a little as the new "memories" took hold, then she gave a slight jump of surprise as Ben flinched and A small bit of purple energy sparked around Ben for a second.

"What just happened?"

Quickly she used a side benefit of the memory spell, and took a small glimpse into Ben's mind. As she does, she is greeted with different memories. Not the ones she just gave him, but ones that seem to still be going along the same theme. Of the Red haired girl, defeating Ben in a dare. And punishing him with wearing girl clothes. But then, he was trying less and less to win the dares. And losing a dare was slowly becoming more and more of the excuse to others as to why he was wearing girls clothes.

Suddenly the rivalry with the red head became a friendship. She was coming over to play video games and helping with homework. He was going to her place to have sleepovers, and to try makeup.

Gwen pulled out of Ben's mind for a moment to check on the real him. He had decided to sit down on a nearby bench obviously deep in thought. And then she noticed it again more sparks of purple energy.

"What's going on? It's like Ben has taken the memories I gave him and are adding onto them himself."

She decided to dive back into his mind. But as she did she came across some memories that she didn't notice before. More specifically memories that were already there. Ben didn't have any friends. He had classmates and people he would hang out with and trade sumo slammer cards with. Would goof off to in order to get some laughs and by extension attention. But it was very easy to tell but none of them were actually his friends. Or that they would hang around with him outside of whatever they wanted.

"Oh shit."

That's when Gwen realized, The redhead she made may have been embarrassing Ben but in a sad way she was the closest thing to a friend he'd ever had.

But then that still didn't explain how Ben was somehow adding to the memories.

As she left his mind again to look him over. Something called her eye.

As Ben stood up from the bench and stretched she finally noticed that his figure looked a little different. His arms look slimmer his legs looked a little longer and if she wasn't wrong his hips looked a little wider.

just then another spark of purple energy around Ben appeared and it was like the lightbulb moment for her.

"Wait is Ben GAINING magic them more feminine he becomes?"