You should wait for the right opportunity and test the waters before you do something risky like being romantic. Why not engage in a more date like behaviour, dinner, movies, DVD night and then see if planting a kiss is appropriate.
I once dated a girl who wasn't interested in me, but she let me get as far as watching movies at her place and me kissing her (which she enjoyed). Too bad we didn't have the right chemistry. But you can create interest, by being interested yourself even if interest is not really there to begin with.
Don't cry, don't regret and don't blame
Weak find the whip, willing find freedom
Towards the sun, carry your name
In warm hands you are given
Ask the wind for the way
Uncertainty's gone, your path will unravel
Accept all as it is and do not blame
God or the Devil
~Born to Live - Mavrik~