It's common for romance novel titles to include the major tropes, e.g. The Scandal of the Duke’s Secret Baby. Here are some example titles from the Amazon Top 100(https://www.amazon.com/Best-Sellers-Kindle-Store-Romance/zgb...).

• Truly Madly Deeply: A Grumpy x Sunshine Romance

• Temptation Trails: A Small-Town Romance

• Phantasma: a Dark Fantasy Romance

• Madness: a Dark Revenge Romance

• Meant For Gabriel: A small town, single dad, surprise baby romance

• Little Stranger: a Dark Taboo Romance

• Sexting the Silverfox: An Age Gap, Single Dad Romance

• Brutal Savage: A Single Dad Forced Marriage Irish Mafia Romance

• Twisted Love: A Grumpy Sunshine Romance

• Beautiful Beast: An Age Gap Forced Proximity Mafia Romance

• Obsession Falls: A Small-Town Romance

• Flawless: A Small Town Enemies to Lovers Romance