From the Chronicle of the Angel Near.

Few know that Beyond Birthday, was once an angel. The most beautiful angel in Heaven.
All envied his wings - those magnificent white and bright wings, which at that time, once opened, were immense.
But B, despite being the most beautiful angel of Paradise, was not happy.

Many angels usually have a boyfriend or a girlfriend - he did not.

Not because he was loved, indeed, but none of the blessed souls who shared his fate was to his liking.

B, like all angels, had not a heart. Or rather, he had it, but it was still.
The heart of an angel beats not to make blood circulate in the body as it does in any mortal - an angel's heart beats just in front of his soul mate, and in our veins flows the divine ambrosia.
One night B was looking down into human world, when he saw a young man in his early twenties, sleeping in his bed. And the unthinkable happened. B's heart began to beat.

Relationships between angels and mortals are forbidden, and Beyond Birthday knew it, but he could not find peace.

They say that he spent whole nights watching this young men, yearning for him.

He was not a nice guy- he had deep black circles, scoliotic spine, eternally mussed hair - but B really liked him.

The angels of his circle, at that time, believed that B had gone mad.

Nothing gave him peace, exception made for watching the young man as he was performing his daily activities, and even then B complained because he was away.
So his mind conceived the idea that no angel would ever have: to reclaim a wish to be fulfilled by his Creator.

"You came here to ask me to fulfill your greatest desire. So what? "
"I want that boy! I can not live without him! "
"This will mean a sacrifice on your part, Beyond."
"I do not care. Cut off my wings, make me mortal, if necessary! "
"You're going to Hell for the sin of Lust, B."
"So let it be!"

If it was forbidden to love a mortal, sharing his bed would have condemned to hell B after his death, the angel who had sinned. But that did not matter to B, because he willingly accepted his fate, although he had the opportunity to give it up and save himself.
Here it is true that love kills. At least for us angels. At least for him.

Beyond Birthday's cries echoed for days as the wings were torn off and in his veins blood flow was made.

He was an angel beautiful and strong - now he was a weak man, and his beauty was like that of many other mortals.

A few days later, Beyond Birthday, Angel made mortal, was thrown on Earth.