You Owe Me One (Completed)

For fifteen years, Colin Bridgerton has enforced one unbreakable rule: nobody dates his little sister. It isn't a suggestion, a threat, or even a family joke-it's law. An entire university has learned to fear the consequences of ignoring it.

Which makes it deeply unfortunate that Francesca Bridgerton has been secretly sleeping with Colin's best friend for over a year.

With the help of an elaborate fake relationship between Michael Stirling and Penelope Featherington, the deception has worked flawlessly... until one forgotten laptop brings the entire house of cards crashing down. But as buried secrets unravel and carefully crafted lies come to light, Colin discovers the betrayal that truly shatters him isn't Francesca's relationship.

It's realising that the only woman he's ever wanted was never Michael's to begin with.