What Are The Best Erotic Book Series With Strong Emotional Tension?

So I just finished 'The Unwanted Wife' by Natasha Anders, and wow. I've read a lot of stuff where the 'tension' is purely physical—like, they hate each other but also want to jump each other's bones, which is fine, whatever. But this one actually makes you sit in the emotional fallout of a transactional marriage. The way he slowly realizes he's been a colossal jerk, not through some big event, but just by seeing her pull away... it's brutal. It's less about the spice and more about the dread you feel waiting for him to wake up and fix things, knowing he might not. You can find a similar kind of slow, agonizing unraveling in 'The Kiss Thief' by L.J. Shen. It's got that whole arranged marriage mafia vibe, but the real conflict isn't the external danger; it's the quiet war of respect. She's not some passive heroine. Her defiance is subtle, and his anger at being challenged by someone he views as 'lesser' creates this incredible push-pull. The intimate moments feel like battles, and the emotional release later actually means something because you've felt every slight along the way. A lot of newer books try to shortcut this by making the male lead just possessive from page one, which lacks nuance. The best ones, like these, make you question whether the romantic payoff is even deserved, and that's a far more interesting read.