My first gf and i used to 69 with our belly buttons all the time. She had a belly button fetish as well aand loved to finger and lick my belly button all the time. She used to call it belly button sex...and i loved it! Her belly was nice and soft and she had a deep innie. I would burry my tounge in it for hours making her moan as I swaped my tounge out for my finger every now and then pushing it deep into her soft belly. Then she would return the favor and due everything i had done to her. The feeling of her tounge swirling around deep in my belly button would get me so excited! I really miss her.