You need to break this down to simpler sentences if you hope to get this translated. Are these your words, because to me the wishes sound weird.

Excuse my for trying to change the English, but I want to help potential translators.

I only wish to be the only fountain of love in from which you drink, as every drop will bring upon give you eternal fulfillment. (The first ´only´ is removed, as more wishes follow)

I wish my eyes would be the only ones you gaze in deeply, as they will only let you see show the pureness of my loyalty.

I wish the beats of my heart my heartbeat is the only ones one that you feel in your heart, as only them it can make you feel alive and strong.

I wish your lungs would only need my air, as I know it will be the only air you need. (this sounds really weird to me)

I wish my blood would flow slowly in your veins, as if it is of on the path to your soul, that and will connect yours to mine, for us to rejoice in eternal bliss.

I wish my path is the only one you would ever walk on, as by my side forever you will never walk alone. (my attempt to re-word the sentence is below, but maybe the meaning is too different for you)

I wish my path is the only one you will ever take, as you will never walk alone, as if forever by my side. 

All I desire is to make your deepest dreams a reality and your reality a dream.

(The first part of this sentence I understand, but maybe I´m not romatic enough to understand the last part.)

All I desire is to make your deepest dreams (desires?) a reality, and your realities dreamlike.

Neyse, .......