The Dragon explained the situation
there was only one of Him and about seven billion humans that needed fattening up.
The Dragon was offering the 4 giggling girls a standard 10 year contract to be his agents and fatten up other humans on his behalf.
The blue liquid in the bottle would give them the Power
and he would be sending them lists of humans through time and space the Dragon had always dreamed of fattening up but had never had the time or energy to do so before.
"Or else!!!" said the Dragon of Fatness as he showed his sharp dragon teeth in a not so subtle hint
of their alternative fate.
So quickly enough the 4 new Agents of Fatness took a swig of the blue
liquid and felt the power of the Dragon coursing in their veins.
That done the Dragon sent his 4 Agents on their first mussion through time and space to fatten someone up.