Writhing an non vocal letter before the tone in Lyrics

[Stjepan Horvat]

Hello, Is there a solution for my problem?! I'm from Croation and am writing a 
song-book for my friend..In Croation language we use consonant's before a word..

An example:

A phrase "s tobom" means "with you" but the letter "s" does not go under the 
tone.
So i tried to do something like s_tobom or "s tobom" but then i would wan't 
the word tobom to be in the center of the tone and not the whole fraze..
it does not look good..
here is an lilypond example:

\version "2.12.3"
\relative { c4 c d4 e }
\addlyrics { i -- dem "s to" -- bom }

or is there a way to write a letter under the \grace tone..maybe that could be 
a 
soultion..

I would want when i write a word under the tone that it defines like that 
"word" 
and than add's s on the left side of the word..so its s+"word" and not "s+word"

Thanks