Your mom entered your shed to see your sister there, with a look of surprise on both their faces.
"Hiya hon! What are you doing in the shed?" she says, after a short smile on her face. Your Mom's name is Barbra. She is about 5'7'' with blonde hair, dark blue eyes, and big full lips. Her breasts are 40, DD and look exactly like they did twenty years ago, because she breast fed you kids. She still works out after all these years, so she is in tip top shape.
Your sister looks down, and then up again. "I'm checkin out these weird chairs, ma. I think they must be fancy message chairs, or something, cause they seem to be all electrical n' stuff!" She pointed at the control box in the center and made a small clapping motion. Your sister, Joana, is 5''' with blonde hair, lighter then your mom's. She has sky-blue eye's and your mom's full lips. Her breasts are only B-cups, but she makes up for it with her long legs and hour glass figure.
Your mother made a surprised look on her face and headed to the other chair.
"Oh! It is our anniversary today! Maybe your father got it to me as a gift?!"
She opened the other chair and sat down.
""Perhaps we should give it a test run?" your mom said excitedly, "I'm sure your father won't notice, let's use it! How do you work this thing?"
Your sister too a look at the control panel beside her. It had quite a few unmarked switches and levers, all which she didn't want to push. But then she noticed the big red button that was label initiate. She pushed it with a squee and the doors to both pods closed simultaneously. The machine made several whirring noises and initiated the change. Both your sister and your mother black out.
About ten minutes later, your relatives push open the doors of the seperate pods and hazily get out. As soon as they totally regained conciousness, They gasped in surprise.
"What happened?!" the both simultaneously said.
Then the machine made a whir noise and spoke in a seductive female tone. "Transfer complete. Please wait 12 hours for next transfer, as per the first time transfer rules. Powering down to recharge...." All of the lights on the machine went of, except for one, which was a small battery symbol. It had no bars in it.
Then your mom, who was in Joanna's body, freaked out.
"No, no! Today is my anniversery! Your father and I had something specail planned! And can't romance him in.. this!" She pointed down at her new body and examined her new breasts with a sigh. They were definitely not hers.
"Woah! Woah!" your sister said, raising her new motherly, finger. "Romance?! I can't.... I can't have sex with my own dad!"
Your mom's expression turned sour and she put her hands up. "Hold on... Give me a sec..."
She stood solitary, grasping her forehead in meditation. Then she looked down at her watch.
"Okay... dinner starts in one hour..." she starts. "You can do that... Just be nice, and smile alot... When it comes time to have sex... Just tell your father that you have... something special saved for him tomorrow." At this Joanna, who was in your Mom's body, grimaced, and shook her head, trying to get rid of the mental picture.
"Fine!" she said. "But you best be ready to switch back!"
"Oh, no worries. I would want to keep my husband waiting. This could make or break our relationship...." your Mom looked back at herself and gave a short smile. "Let's get you into my dress. Best not keep Dad waiting." With that they both head out of the shed and into your Mom's room, getting ready for dinner.