If beginning wasn't so difficult, I'd start with your heart. With my head pressed against your chest, from the very beginning, I trust it - it and it's racing rhythm. I think perhaps only half of what I hear is your own. Because half of it is mine, as I hear the blood rushing through my ear.
If middles didn't need to be so complex, I'd elaborate; gently. The simple truth is that my heart doesn't even deserve yours. Mine is cold, and closed, and controlled. "Love who I say to love." But yours is open, and patient, and loving, and I learn from it, as it slowly thaws my own.
If endings didn't hurt, I'd like to say your heart is the end of me. I think your heart compells me to love more freely, for mine beats a different and new beat; it beats for you. And I believe I could love your heart, until the day my own gives out.