One thing I've noticed in writing groups is how often 'show don't tell' gets repeated like a mantra, but in romance, it's the whole ballgame. A tip like 'show longing through small gestures' isn't just about technique; it forces you to inhabit the character's sensory world. Instead of writing 'he missed her,' you have him automatically setting two mugs out for coffee, then staring at the extra one. That tiny, specific action builds a bridge for the reader to cross, because they've probably done something similarly mindless themselves.
It's those shared, humanizing details that forge the real connection. Another useful piece of advice is to give the characters separate, meaningful conflicts outside the relationship. If the emotional stakes are only about whether they get together, the tension can feel thin. But if each person is wrestling with something internally—a career failure, family pressure, a secret shame—then their choice to be vulnerable with each other becomes a courageous act. The reader roots for the relationship because it represents healing or courage, not just completion.
Tips about pacing the 'first touch' or the 'almost kiss' are really about managing the reader's anticipation, which is a form of emotional investment. You're letting them live in that delicious, agonizing space of 'what if' for as long as possible, so when the connection finally happens, the release is earned and meaningful.