Sarah and Doug went in their room and Eric and Nate went into their combined room. In the larger bedroom Sarah and Doug started setting up their living spaces, but weren't talking that much. In Eric and Nate's room however.
Eric asked "Hey Nate, did you see any outlets?"
Nate sighed and said "You better not be setting up for an all nighter when we're sharing a room."
Eric looking all over the room said "I just want to know there's a place around here where I can charge my things..." then when he checked behind the beds he found an unlabeled button. A little curious Eric moved the bed a bit and went for the button.
Around the same time Sarah had set up a small make-up station and she spotted what looked like a timer of sorts, but she thought it may have been a dimmer switch. She was curious about it and put her hand on the wheel. Before she moved the switch Eric being curious pressed the button and then a special magic part of the cabin activated. An Aura enveloped the house and in a near instant they changed really fast. In their room Eric and Nate shrunk a few inches as their hips and breasts started growing. Then their clothes changed into more gender appropriate clothing as they quickly changed into two teenage sisters. In the parent's room Sarah grew bigger along with her clit extending into a penis, and Doug was undergoing a similar change to Eric and Nate. Confused Sarah's hand turned the timer to the left and then the aura came back but a bit different. Sarah's body started youthening with her male muscles getting more solid as if remembering she was an athlete in the past but didn't have the testosterone, Doug's now existent but saggy breasts started to firm up and appear bigger as everyone in the cabin was getting 15 years younger. In the other room again Eric and Nate's bodies and curves were shrinking.
As Eric's breasts and ass had almost completely flattened she said "How did one button do all this?"
Nate's breasts then flattened and she said "I have no idea what's happening, but stop complaining would you?" Then they kept shrinking and Nate realized "Wait, Eric you think we'll stop regressing soon right?" As their clothes started turning into sundresses.
In the other room Doug's breasts were starting to get a little sore and said "Whatever's happening i'm feeling even stranger." and then her breasts started to lactate as her bra changed into a nursing bra.
In the little girl's room again Eric was a small baby on the bed and a concerned toddler of Nate who could barely speak properly asked "Ewic? You okway?" and was really scared as the two of them kept getting smaller. Nate's panties changed to diapers as Eric became a newborn and a moment latter popped out of existence. Nate got really scared as she lost her ability to balance upright properly and fell on her back.
In their parent's room when Eric vanished out of existence Doug's stomach suddenly grew really large having been filled with a baby, but it was getting smaller. Doug said "Holy... Wait, do you think that's?" as her belly got smaller.
Sarah said "Oh god! Eric!" and put her hands on the stomach and said "Please stop getting smaller!" and while Doug's stomach seemed relatively flat there was a little bulge as everyone had stopped getting younger.
Doug said 'I guess that explains why I had started lactating as I was changed to their mother... Oh god! If this is Eric then Nate must be..." and Sarah figured it out as they all went to the other room where they found a baby girl crying by herself on a bed.
Doug's new maternal feelings made her rush to her baby's side and pick her up and cradle her saying "There there Nate. It's ok. We've stopped getting younger. Your brother's still in me, just a little small."
The little baby still was mature at heart and understood and stopped crying as she felt secure.
Sarah looked and saw one of the beds had been moved and spied a button. She said "I think one of our boys must have found a button and pressed it. Think that's what did this?"
Doug said "Maybe... it may be a little too dangerous." The couple started to think what they should do and then...