Biff headed back to the room he had woken up in to see if he could find something. After he left, Jon made his way over to the closet to see if he could find anything less embarrassing than the diaper he was currently wearing. Sadly he didn't find any underwear, just more diapers, exactly like the one he was wearing. He did find a vest which was good enough for now. All the rest of the clothes he could see were either too girly or too babyish, dresses and onesie of all colors. Putting the vest on Jon made his way out to the hallway. His walk was a little bit different as the diaper was pushing his legs apart slightly, forcing him to waddle just a little bit as he walked. The diaper also made a crinkling sound with every step which only added to his embarrassment.
Biff met Jon in the hallway. He hadn't had much luck either and was wearing a very short dressing gown over the very short slip. As they looked around they saw that they were upstairs in a small house. They could see their respective bedrooms, a bathroom and a stairs going down to the rest of the house. As they passed the bathroom, Biff felt the urge to go. He asked Jon to wait for him outside the bathroom as he was, admittedly, a bit freaked out by this whole experience. Jon stood patiently outside.
Biff walked in to the bathroom, he opened the front of his dressing gown, lifted up the bottom of his slip and released his penis from his panties. He leaned over the toilet bowl with one hand to better direct the flow. Outside the door Jon could hear Biff starting to go. Without any warning Jon himself started to pee too, straight into his diaper. He was instantly mortified and felt the diaper sag slightly and a warmth enveloped his whole groin. These changes must go beyond just clothes.
Jon heard the toilet flush and tried to regain his composure. Biff soon came back out, still in the middle of tying his robe.
He was too embarrassed to say anything to Biff just yet so he tried to ignore the warm, wet feeling and followed Biff downstairs.
Downstairs the house was fairly modest, a small kitchen led out to a dining and sitting room which had a playpen and a few baby toys as well as a TV and couch.