Oh, yandere romances? That's a wild niche! I stumbled into this rabbit hole after reading 'Killing Stalking'—it's technically a manhwa, but the obsessive, possessive vibes totally fit. For books, 'You' by Caroline Kepnes gives that unsettling romantic obsession from Joe's perspective, though it's more thriller than pure romance. Then there's 'The Collector' by John Fowles, a classic about a guy who literally collects his love interest. Dark, but fascinating if you're into psychological twists.
Recently, I found 'Harrow Lake' by Kat Ellis, which blends horror and yandere-esque obsession in a small-town setting. It's less romance and more 'what the heck is wrong with people,' but the tension scratches that itch. If you want something lighter but still unhinged, 'The Shadows Between Us' by Tricia Levenseller has a morally grey heroine who’s like 'I’ll kill for you, but also maybe you?' It's a fun mix of dark humor and obsession.