Vash shaving Nai's hair, then they realize they're not matching anymore as twins so Vash shaves his own hair off as well but this was Nai's plan all along...

He quickly rubs their bald heads together in a romantic gesture of love only known to plants. Vash instantly falls in love, unable to win over his primal instincts. Their veins light up beautifully, especially on their perfect baldness. Making any living creature in a 10km radius sight their otherworldly coupling and magnificent bald heads.

Nai succeeds and takes over the world hereby, they live happily ever after

Bald Nai triumphs.