"Good news, guys!" Bulma anounced at dinner. "I've finally completed the portal based time machine and calculated the correct time and dimension to send you back to. You can go back home tomorrow."
Bra cheered. It was fun visiting this world, and she even had her mommy here, and a much nicer big brother, but she missed her papa very much. Pan was happy to get back too, but she couldn't help feeling anxious. "What's the matter, Pan?" Mirai ChiChi (Yes, Mirai ChiChi was still around in this universe. She still lived in the house she and Goku lived in the East District, alone.)
"What if daddy got mad?" Pan asked, still remembering that the whole reason they were here was because she messed with her father's work. Her father seldom got mad, but when he does...
"Don't worry, he won't," Mirai ChiChi answered her alternate timeline granddaughter. "Tell him I forbid him to get mad or punish you for going to visit your grandma. You have 5 witnesses here to vouch for you." Pan smiled and hugged her. Goten smiled too. His mother was his mother, even in another timeline.
ChiChi was happy, but sad at the same time. Happy knowing that in another dimension, she had raised a happy family. Her Gohan had grown up to be a scholar as she had always wanted him to be, Goku was still alive, and Goten who didn't even have the chance to exist in this world had grown up to be a fine young man. But she was also sad because after this she will be alone again, and it's harder when you know what you've missed. But she's a strong woman, and will go on no matter what.
The two Trunks looked at each other. "How about a little sparring session before you leave?" Mirai Trunks asked his alternate counterpart. Trunks grinned. "Thought you'd never ask."
So after dinner, the two Trunks headed to the gravity room for their sparring session.
Half an hour later, Trunks and Mirai Trunks emerged from the gravity room, bruises and cuts visible here and there on their bodies. Trunks was wearing Mirai Trunks' jacket and Mirai Trunks wore Trunks'. Apparently they had a good workout, and had formed an alternate counterpart bond between them, Saiyajin style.
ChiChi spent the night in Capsule Corporation, since the children and #17 were leaving early the next morning. That night everybody slept late. They talked until late, knowing that they will never see each other again. Finally everybody went to bed to have a good night's sleep, glad that they met each other and sad that now they'll have to say goodbye.
The next morning, Bulma got the time machine ready, while ChiChi prepared a delicious breakfast for everybody. The machine was a handheld device, similar to Gohan's but smaller and less crude. It also had the customary Capsule Corp. logo on it. It was connected to Bulma's supercomputer which calculated the correct time and dimension to send the visitors back. It also features a prominent red button like Gohan's device, used to open a portal to the other timeline. However, to ensure that nothing else is sucked by the portal, they will have to use it in an isolation room that Bulma had already constructed.
So after breakfast, and when everything was ready, Mirai Trunks, Bulma and ChiChi said goodbye to #17, Trunks, Goten, Marron, Pan and Bra. They then stepped into the isolation room while Bulma worked on the device.
"Send my regards to everybody," Mirai Trunks said as he shook hands with Trunks. "We will. You guys take care." Trunks replied.
Mirai Trunks, Bulma and ChiChi waved their last goodbyes, and #17 and the others did the same as a portal appeared and swallowed them before slowly disappearing amidst a puff of smoke, taking them away from Mirai Trunks' world and back to their own.