A lullaby for my lover?

A sexy instrumental... I know not of one. Unless... No, nevermind. Wait. How about Christmas Canon, without the vocals. Download it and listen. You will like it.

A Song For A Sleeping Girl by Devics

First, assuming that by "my lover" you mean "my sexual partner" and by that you mean "my whore". I can only pose the question, why not ask her to be your girlfriend? Ok, all joking aside. The best thing to do would be to write the song yourself. You could honestly name it "crap sandwich", however, if it sounded good it really wouldn't matter now would it. I mean hell, eric clapton's "classical gas" makes me snicker in the "I'm 10 years old again way", however, I respect it as being my favorite acoustic song despite the naming.

Lullaby by the Cure... it was the fastest and easiest to think of

Hmm Hmmm Hmmm hmmmmmmm hm hmmmmm... HEEEERRRREE's SAAAAANTA!

"Cannonball" by Damien Rice

look up a sexy song and sing it 2 her!! or make up your own sweet song. she'll really like that!! have fun!!