Need help finding a song.

[SpikeOtacon]

I just heard this song on the radio the other day...I have heard it before, but I do not know who it is by/what it is called. In the song, this guy sings to this girl about wanting to make her a vampire, wanting to make her beauty last forever. He also says "So help me, jesus" at the end of each chorus. I also remember the line "Do you want to die?" being repeated often.

Help?