The Guide to Seducing the Best Friend's Sister

The first thing Holden should remember when he first thinks about seducing his friend's younger sister is that he shouldn't do it. Seriously. First of all, those are the rules. Secondly, Holden promised to look after her, and he is... definitely not a suitable match for her—he's not only a womanizer, but also a musician with unclear prospects. And Lala is a real brainiac: kind, understanding, a talented scholar—it's no surprise that she already has a fiancé. So hands off.
But then Lala is offered a grant for research in New York, and for the next few months they will be neighbors in an apartment building, finding themselves dangerously close to each other. Holden makes every effort to play by the rules, but every day he feels something in her words, her gaze that makes his blood boil. But what is it? Just desire? Or is it something more serious?
And what will happen if they go against the rules?