Stannis did what he did more out of utter desperation than anything else, certainly it wasn't love or lust or being dominated by Melisandre. His army was snowbound and low on food, from a rational POV his choices were to sit there and starve, or sit there until his men mutinied and killed him (and the choice between those options was not his). He had absolutely no good options, and when Melisandre said that all his problems would be solved if he did what her horrible deity wanted, then the snow would melt and he could go on with his campaign. Well, since she'd been right in the past and had shown that she definitely had supernatural powers, he grasped at the only straw anyone offered him.
Stannis wasn't too bright.
And no, Melisandre isn't a bandwagon-jumper or hungry for personal power, she was a true believer in her horrible Red God. One who overestimated her ability with the aforementioned supernatural powers, and realized it before the end. But her end game wasn't power, it was to promote her horrible God and fight the Night's King.
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