its sound like what I call chaining orgasms.
Meaning a really long and intense orgasm (minutes long) , with lots of peaks during that period, one after the other, without ever coming down from the orgasmic base, or any need for a cooling off period.
If you provide the right context, they can ride the wave for several minutes, until they are simply too tired to continue.
Multiple Orgams is something different, its just more than 2 discrete orgams during sex.