Kat took a moment to contemplate what inanimate form would best fit Dan. It had to be something that could not be noticeable being in the house, while giving Dan what Kat believes he deserves. She had been fantasizing many things over the years if she had ever had the opportunity. Now that she has it, the possibilities were endless. But she wanted the first choice to hit home.
Then she remembered an old punching bag her dad had been meaning to replace in their home gym. Their dad was a health and fitness guy. His old one had gotten worn over the decade of use. He constantly used it, but made sure to maintain it quality for as long as he could. It was time to replace it.
Kat had the perfect way to gift her dad something he needed and wanted. While making sure Dan got the beating he deserved. Kat smirks as she looked at her disbelieving brother. With a waves of her hand and in image of a brand new punching bag in mind, she casted her spell.
Dan does not believe Kat taunts of magic. Its fantasy that should be left in books and movies. Its not real. He stood watching her thinking. He wants to see her absurdity play out. So he was unprepared to see a ball of spellwork zip towards him and hit his chest. He immediately felt a tingling throughout his body. His eyes widen in shock, but he didn't have time to complain as the spell started it work.
His skin started to change into leather, while he felt his organs shifting into the stuffing for the punching bag. Dan was in silent horror as each change occured. He couldnt scream as each change was mind-boggling. His arms lifted up and transformed into chains to hang from. His legs merged as his body started to bloat and shape into an oblong form.
Kat had made the whole transformation painless. She wanted the real torture and pain to occur when he was being used with their unaware dad. She grins as each transformation finished after some time, Dan was no longer her human brother. In his place was a punching bag ready to be set up.
With another wave of her hand, she teleports the new punching bag to their basement. Then makes her way down. On the way he contemplates how to ensure no one figures out where Dan is. She decided on a forgetfulness spell directed to Dan specifically. Anytime people think of him or get suspicious, the spell should make them forget or redirect their attention to something else. Simple enough for now. She will need to think more later.
When she arrives in the basement she spots the new punching bag hanging and ready for use. She nods pleased with herself. Now her brother will not bother her or ruin her birthday. She pats the bag with a sinister smile.
"No one can hear you. No one will know its you. Everyone will forget you. Maybe I'll change you into something else later. Maybe I'll mentally listen in to your anguish. But regardless of those possibilities. For now you are my gift for dad. You know how much he missed using his punching bag for his work outs. He will make sure you get the best use. Enjoy your new life, Dan!"
She walks away as she can hear her parents coming home. Giving one last pat on the new equipment, she went back upstairs. She happily greets her parents and helps setting up for her birthday party. Hours later, she would take their dad down to see the new gift. Dad was beyond ecstatic and kisses her forehead in thanks. Dad can't wait to use it tomorrow after a night of celebrating his favorite child.