Is Crossing The Line Sleeping With Best Friends A Common Trope?

“You have no idea what you’ve done to me. I’ve been replaying every sound you made, every way you came apart for me.” His grip tightened. “I’m not letting that go. I’m not letting you go. Fuck the friendship. I want you.” I let out a little gasp. His thumb rubbed across my lower lip. “I don’t just want to fuck you—I want to keep you. You’re my favorite sin, and I’ll commit it again and again until you understand you’re mine.” His lips twitched a little. “You’ve always been mine, Savannah.” ——- Her sister is marrying her ex. So she brings her best friend as her fake fiancé. What could possibly go wrong? Savannah Hart thought she was over Dean Archer—until her sister, Chloe announces she's marrying him. The same man Savannah never stopped loving. The man who left her heartbroken… and now belongs to her sister. A weeklong wedding in New Hope. One mansion full of guests. And a very bitter maid of honor. To survive it, Savannah brings a date—her charming, clean-cut best friend, Roman Blackwood. The one man who’s always had her back. He owes her a favor, and pretending to be her fiancé? Easy. Until fake kisses start to feel real. Now Savannah’s torn between keeping up the act… or risking everything for the one man she was never supposed to fall for.

For years, eighteen-year-old Mia has been secretly in love with Ethan — her older brother Jake’s twenty-two-year-old best friend. To Ethan, she has always been the little sister he promised to protect. But with their parents away for two weeks, Mia refuses to stay invisible any longer. Determined to make him see her as more than just Jake’s sister, she begins spending more time around him, testing the boundaries of their long-standing friendship. Ethan tries desperately to resist the growing attraction, torn between his loyalty to Jake, his own responsibilities, and the undeniable pull he feels toward Mia. As the days pass and emotions run high, the careful distance between them starts to crumble. One unforgettable night and everything changes. Now the line has been crossed, and neither of them knows if their friendship or their family will ever be the same again.

From Best Friends To Secret Lovers!! Rory and Todd have been best friends for thirteen years. They thought they knew every secret between them but a playful dare unlocked a lifetime of hidden feelings. It strips away the pretense and leaves only a burning, undeniable truth: They’re in love. But now they have to battle the outside world that is desperate to keep them as ‘best friends’

Ash and Alex are best friends actually long time friends. One of them is Alpha and one is omega. They are interns on their last year of medical school. And they are also part of same club. One of them has fallen for the other. Will he be able to finally confess his feelings? Ash and Alex know, they can feel it. But again they don't talk about this. Mating with your bestfriend is not good idea. Isn't?

Katherine Heart has been in love with Damon Rhodes for three years, which would not be a problem if Damon was not her ridiculously handsome best friend who keeps acting like her boyfriend without ever actually calling her his girlfriend. One minute he is kissing her breathless, telling her she is the only girl who truly understands him, and the next minute he is dodging every conversation about commitment with that stupid charming smile of his that should honestly be illegal. But when Damon drags Katherine to a luxury ring shop, she is convinced this is finally it. Until she realises it's not her. Humiliated, heartbroken, and determined to never let Damon see her cry again, Katherine throws herself into her internship at Rhodes Enterprises, where long hours and impossible workloads are easier to survive than watching the man she loves fall for someone else. There is only one problem. Nathaniel Rhodes, Damon’s older brother. Cold, terrifyingly powerful, and completely off-limits, Nathaniel is the kind of man who can silence an entire boardroom with one glance alone, yet for some reason, his icy eyes keep following Katherine everywhere she goes. And when one late night at the office leads Katherine to discover a side of Nathaniel nobody has ever seen before, his cock in his hands as he helplessly moans her name, her messy heartbreak suddenly turns into something far more dangerous. Now trapped between the boy who broke her heart and the man who could completely ruin her, Katherine is about to learn that love triangles are a lot messier when billionaires, jealousy, office scandals, and unresolved tension are involved. Because falling for one Rhode's brother was already a disaster. Falling for both of them? Absolutely catastrophic.

My best friend had one rule: stay away from my brother. But what he didn't know was that his brother kept me up all night. Wren Mercer had spent years being just Ross's best friend. Fine with holidays at the Calloway house, years of watching Dani, Ross's older brother, move through life like nothing could touch him, fine with the fact that he never once looked at her like she was worth the trouble. So she did what any sensible girl would do, she found someone else. Blake Hendrix was everything that made sense on paper. Charming, attentive, and most importantly, not Dani Calloway. She told herself it was moving on. She told herself it was working. What she didn't know was that Blake had his own reasons for getting close to her, ones that had everything to do with the brother she was trying so hard to forget. When Ross invites her to move into their off-campus apartment, she tells herself it's still fine. She has Blake. She has a plan. Dani barely registers her existence anyway. She can handle proximity. She's wrong. Because Dani does notice her. He always has. What starts as tension becomes stolen moments, a secret neither of them planned, and the slow terrifying realization that this is the most real thing either of them has felt in years. But Ross is right there. Blake is closer than she thinks. And secrets don't stay hidden forever. She fell first. He fell harder. And what breaks between them might not be fixable.