(original answer: No, they never kiss.)
Actually, while it is probably likely that they never shared a romantic kiss, due to her being completely turned off by his obsession with the dark arts, it is equally likely that he may have given her an akward kiss on the cheek at Christmas under the mistletoe, which she would have politely accepted (prior to the worst memory incident) in the spirit of the season.
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It is clear from the books that Snape was in love with Lily Evans. The books do not, however, go into such details as asked in the question.
Snap loved Lily, and probably wanted to marry her and have a baby with her someday, if James didn't. But if they did have a child, it would be a completely different person. When Snape first met Harry, he thought that he resembled his father, who he hated. But towards the end, you find out that he had protected Harry many times; which probably meant that he did want to be Harr's father.
Thanks to the incomplete prophecy told to him by Severus Snape, he believed that Harry Potter was the only one who could destroy him. Thus he went to the Potters' house, killed Lily and James, and then attempted to kill Harry. You know what happens after that.
No, he's not. He makes the Unbreakable Vow with Narcissa Malfoy, promising to watch over Draco and help him with his task (killing Dumbledore), and to kill Dumbledore himself if Draco can't do it. But he is never appointed godfather to Draco.
Harry Potter attained his lightning bolt scar when he was 1 year old. When Voldemort came to kill Harry (because of the prophecy "neither can live while the other survives"), Harry's mother, Lily Potter (formerly Lily Evans) refused to stand aside and gave her life to save her son. Because of her sacrifice, Voldemort's curse backfired, leaving Harry with only his famous lightning shaped scar.
She was a baby model for Sears, an she now models.. We go to Modeling School Together