Cham
You have thrown a curveball into the equation.
First love is first love. There is no feeling that can express the way you feel when you fall in love for the very first time. Fluttering is the heart is one of the many feelings you experience. They way you touched and felt and as if time meant nothing are among some of the symptoms.
Words just cannot describe the feeling of being of love for the very first time.
Rev is a man of words, he can perhaps provide us with a more expert explanation of first love.