It’s not that Heartsong is directly enhancing the aura, it’s that the goals are so complementary that they create what I call a “perfect pair.” People are misunderstanding what Heartsong does. It’s not for just monogamy. It’s for any kind of romantic pairing – even casual sex. Whatever your perfect partner is, Heartsong helps you manifest them. That means, for someone who wants casual sex, Heartsong will help with the manifestation of people who have the same mindset as you do (whether it’s casual sex with the hopes of something more, or casual sex and then you part ways), Love Bomb’s aura will increase their positive feelings about you, and Libertine’s aura will stimulate their sexual urges.
As for the other two stack recomendations, Heartsong + Love Bomb will help you bond deeply with the people that Heartsong manifests, and StarkQ / Emperor will provide the alphaness, money manifestations, success manifestations, etc. that you’ll want for a stable, long-term relationship.