bubble fusion

Dear all. I am a medical educator and I am new to blender. I want to make an animation of to bubbles fusing together to make one.
In reality I need to show the fusion of a vesicle with a cytoplasmic membrane that looks quite similar to that. I will appreciate someone to point me in the right direction.
Thanks in advance

The easiest way would probably be to animate two metaball objects converging.

Here you go, should be a good starting point.
CellMerge.blend (84 KB)
It’s fully animated. Looks like this.