Prologue:
It was true. Regina had kissed her. The mayor had kissed Emma. And Emma, willingly, almost pleadingly kissed her back. There was no force behind it. No power or control, just want. Want of another persons body against the others. The warmth of another soul, whether damaged or broken, it didn't matter. It was about someone else who needed comfort, and someone else who could give it.
Emma had realized that this lust, this want, it wasn't just about sex, it was about the comfort of someone holding you; someone gazing at you through saddened eyes and pleading with you to stay with them. To be with them, if only for the night, to make that pain go away. If only temporary, it didn't matter. If someone was there to make it disappear for a moment in time, and if that person was Regina Mills, then so be it.
And yet, in the back of Emma's mind she told herself that this was wrong. Kissing the Mayor, wanting the Mayor, was wrong.
This is Henry's mother. The woman who raised him. He trusts you. He came to you for help. Stop. Now.