You translate "You are my only desire" to Spanish it becomes Eres mi único deseo.
Deseo
To say 'I have the desire to eat' you would say 'Tengo ganas de comer.'
Deseo amor.
yo amo a mis mejores amigas desire y chelsy
you can not because we do not say that if you said that you would sound stupid
only = solamente
Same way you say it in English only you use a spanish tongue.
To say "I only speak French" in Spanish, you can say "Solo hablo francés."
Único or Única
There is only one way to say hello in Spanish: hola.
There is no way to say Ashton in spanish. if you go to a spanish speaking country and ask they'll say your name the way you did only in an acsent.
nomas uno