Regency book about best friends where on purpose causes a scandal brother isforced to marry her and they are upset I think it is a series and each book is about family members or best friends of the main characters.

[Tara]

?

[Grace]

Is the hero a Duke? Did heroine sneak into hero's bed at night?

[Tara]

I think so he is the head of his family and is forced to marry her, she did it on purpose, and his sister is upset at her friend