The Great Fusion Wave struck Earth on September 23rd, 2024. The only trend later scientists could find was that every person in a room, or anything resembling a room, such as a car or yard, would get merged into one body. This led to many people remaining unaffected due to being alone in a room. However, most people were fused together - with fusions ranging from two people to thousands sharing a single body.
Jack had been one of the lucky, unaffected people. He had spent the day locked alone in his dorm room browsing 4chan - his favorite hobby. While browsing, he found about a hoax going around called the 'Great Fusion Wave', with well-done photoshopped pictures backing up the hysteria. He spent the day posting away, creating his own posts and lies, trying to help keep up the momentum of the hoax. But eventually, perhaps days later, Jack would realize that the Great Fusion Wave had not been a hoax at all.
Cindy and Derek had just gotten back from a first date that had gone better than either had expected. They spent the hours before the fusion wave cuddling while watching movies, both waiting for the other to make the move to the bedroom. As the pair had finally made it to the bedroom and were about to start having sex, the fusion wave hit. Instead of two singles about to break their dry streak, Cindy and Derek had been turned into a humantaur. Derek's face had replaced Cindy's pubic mound and pussy, with the rest of Derek's body sticking out of what had been her ass.
The Barret family, finally, had their schedules line up for a family dinner. After everyone had graduated college and started their careers, they hardly had time to see each other. But with the Great Fusion Wave striking while the family shared desert, the five members of the family would all have plenty of time to get to know each other. The fusion put all five of their heads on one elongated set of shoulders. Their resulting body featured three sets of breasts from the former three women of the family, and two cocks sticking out of their now shared crotch. The family stood in shock, unsure of what they could, what they should, do with their bizarre new body.
Jessie had been the fusion created from the patrons of a rock and roll concert held during the fusion wave. Jessie held the record for the largest number of people merged into one fusion. Estimates ranged from 45,000 to 48,000 people had been fused to create Jessie. Jessie, a new conciousness created by the fusion, had a perfect memory of both her own actions and the actions of any of the people that had been fused together to create her. Anatomically, due to being a mix of roughly equal men and women, Jessie turned out to be a hermaphrodite. Jessie featured small breasts, an average penis, and a vagina hidden under it. Jessie struggled with the circumstances of her creation and often tried to find ways to relate to and honor her past lives.
Of course, these are but four of the stories from the day of the fusion wave - there are many millions more.