You and your wife, Amber, are going to her grandparents' mansion for the annual reunion of her family. While dating, she told you about a tradition her family has: every summer, all the married couples in her family swap bodies with each other. The swap lasts from just some weeks to entire months before everyone swaps back. She has many fond memories of her parents swapping bodies with her uncles or grandparents; it was like renting new parents every summer. You thought it was weird, but everyone in her family seems used to it, and they are as crazy and loud as she is.

She was really excited this year since you two married just some months ago, making this her first time being a part of the body swap. At the mansion, you reunited with her family. They all laughed and drank as they wondered who they would swap with this year. The swap is always the next day, with everyone waking up in each other's bodies. Her aunts and cousins clearly wanted to get Amber's young and skinny body for themselves, and she giggled with them as they talked about it. When everyone got to their rooms, she kissed your lips and winked:

"Hope you enjoyed that kiss, 'cause it will be our last as ourselves for a while... I wonder whose bodies we will get..."

You two fell asleep. The next morning, you felt weird; your knees hurt and your back was killing you. A scream and a laugh woke you up. You saw you were in Amber's grandparents' room. You looked down at your new wrinkly hands and then looked at the mirror, seeing Amber's grandpa's face looking back at you. You felt your new bald head with gray hair at the sides with shock.

"OH MY GOD, I'M GRANDMA AND YOU ARE GRANDPA!"

She laughed as she felt her new obese and old body, squeezed her fat belly, and then walked to the mirror.

"Oh, we are so lucky! I always hated being so skinny, now look at these curves, now this is a real woman!"

She laughed, squeezing her new chest, then felt her fat, wrinkly face.

"Oh, and look at you, 'grandpa', you look hot like that."

She stopped her enjoyment when she saw you freaking out.

"Hey, calm down, we will swap back eventually... Come on, just enjoy us being old.... Okay? I swear it will be fun."

She heard her own laugh in another room and smiled.

"Judging by that noise, I can tell it was my aunt Monica who woke up in my body and my uncle Phil in yours. Come on, the best part is finding out who woke up as who. I have to flex these curves to my aunts and cousins... or well, I guess technically to my daughters and granddaughters,"

she said, giggling.