I don't think that you can fake warmth. You can fake lust, jealousy, anger; those are all quite easy. But actual, genuine warmth? I don't think you can fake it.
Red is such an interesting color to correlate with emotion, because it's on both ends of the spectrum. On one end you have happiness, falling in love, infatuation with someone, passion, all that. On the other end, you've got obsession, jealousy, danger, fear, anger and frustration.
Jealousy, that dragon which slays love under the pretence of keeping it alive.
Those who are believed to be most abject and humble are usually most ambitious and envious.
The lovesick, the betrayed, and the jealous all smell alike.