This statement is a passionate expression of love and desire. It conveys the intense and powerful emotions that the speaker experiences for the person they are addressing.
"I could start a fire with what I feel for you" uses a vivid metaphor to illustrate the strength of their emotions. It suggests that the love and desire they feel are so intense that they could ignite a metaphorical fire, symbolizing the passionate nature of their feelings.
Overall, this statement is a poetic and romantic way of expressing deep affection and attraction, emphasizing the intensity of the emotional connection between the speaker and the person they are addressing.