Cup for Two / mug

While you get alone, you expect an elegant and lonely atmosphere.
While we get together, we could share the most enjoyable time.
In the hurry of life, the unexpected visitors, or your close person came,
why not screw the cup into two, sharing the feeling of warm to two.
Within the inner and outer cup are coated with
the metal outer cup surfaces, it would achieve
the effect of Insulation while inner-cup and outer-cup assembled.
The screw-shapped design making the
assembled cup would not easily separate.