You are my sweetheart. How can you reply humorously?

You are my sweetheart. The humorous reply is as follows:

1, oh, then I am your sweetheart, where is your heart?

Then you are my sweetheart, too. We are really still here, and I feel the harmonious heartbeat of the sacred unicorn.

3. I feel that I suddenly become particularly happy because I have you as a lovely sweetheart.