Eurema hecabe

Today, In morning around 10 no. of common grass yellow butterflies emerged at our home/premise. I have captured photo of freshly emerged CGY and move to take photo of other GCY on same branch. At the same instant another CGY came and done instant mating with freshly emerged CGY in front of me within a seconds. Both are on same place more than 2 Hrs.
Please let me know which is Male and Female [Freshly Emerged CGY or Butterfly approached for Mating ?