After Ronnie put one his daughter clothes, he feel embarrassed and excited, he didn't thought that he would like crossdressing now that he looks like a chubby cute tomgirl, he truly become Jim's girlfriend.
Sometime later, Jim and Ronnie go out the house to the park so Ronnie could realize his fantasy, in the way, they found people who were staring at Ronnie, there was even kids on the street saying that 'she' looks cute, Ronnie didn't know what to think about the situation. When the pair reached to the park, they decided to go to most isolated place of the park, then Jim was now standing before him smiling while carrying a backpack on his back.
"Here we are babe, now you can take off your clothes." said Jim smiling to Ronnie.
"O-ok." replied Ronnie feeling nervous.
Ronnie then began to take off his clothes, leaving the pink dress on the floor, taking off his shoes and undoing the pink bow and now his hair was covering his eyes, he was again completely naked in front of his son, he then covered his penis with one hand and with his other arm covers his breasts, at home, he didn't feel ashamed to be naked in front of Jim, but now outside he was too embarrassed to show his body.
"Oh come on babe, you are very pretty, don't cover your body." said Jim to his dad.
Ronnie then slowly move his arms until he reveal his private parts to Jim and a red blush was now on his face as Ronnie look down to his feet avoiding to look to Jim's face.
"There, that's my cute girl." said Jim as he walks closer to Ronnie.
"Ji-Jim, I-I don't think that I can't do this, I feel too ashamed." said Ronnie to Jim while still looking down.
"Huh?..." said Jim as he move his right hand to Ronnie's chin and gently lift his face up to look at him. "Do you feel embarrassed if some stranger look to your cute body?" asked Jim to Ronnie.
"Ye-yes." replied Ronnie in a shyly tone with a deep red blush on his face, he doesn't know why but he seems to like that Jim is treating him like girl.
"I see...Wait, I know what to do..." said Jim as he then take out the magic ballon. "I want for Ronnie to shrink in size." said Jim as he began to blow the ballon.
"Wha-what?" said Ronnie surprised.
As Jim blows the ballon, Ronnie's body starts to shrink in size, with every passed second, his surroundings were getting bigger as his son was becoming a giant in front of him, when Jim stopped blowing the ballon, Ronnie was now 1 foot tall and half, he was now the size of a baby as he looks up to Jim's giant form and Jim was smiling to his now small tomgirl dad, Jim then bend down and lift Ronnie by his armpits and move his body closer to his face.
"There, now you can go a do whatever you want and nobody would notice you." said Jim smiling.
"I see, but you will be here watching me right?" asked Ronnie with his voice who had become acute to Jim.
"Of course babe, I will come to your rescue if someone end up catching you..." said Jim as he move Ronnie closer to his face and kiss his dad. "Now go and have some fun." said Jim smiling to Ronnie.
Then Jim lower Ronnie back to the ground and began to retrieve Ronnie's clothes into the backpack, when he finished he saw how his baby size 'girlfriend' leaving in between some bushes and Jim got a nice view of Ronnie's bouncing buttcheeks.