One great best friends little sister romance novel is 'The Kiss Quotient' by Helen Hoang. It has a unique plot where the male lead is initially hired to teach the female lead about dating, and she happens to be his best friend's sister. It's a heartwarming story with great character development.
The forbidden - love aspect. Since it's the best friend's little sister, there's an element of 'taboo' that adds excitement. For example, in many such novels, the hero has to overcome the fear of ruining his friendship with his best mate while falling for the sister.
A heartwarming tale could be when the best friend's little sister gets lost at a fair. The best friend and his other friends immediately start looking for her. Eventually, they find her near the petting zoo, happily petting a bunny. This incident makes them realize how much they care for her and they promise to always keep an eye on her at such events.
My best friend's little sister was quite shy. There was a neighborhood party and she didn't want to go at first. I told her there would be lots of fun games and delicious food. She finally agreed to come. At the party, I introduced her to some other kids her age. At first, she was quiet but then she started to warm up. We played some games together like hide - and - seek. By the end of the party, she was laughing and having a great time. It was really nice to see her come out of her shell.
One appropriate story could be about how the best friend's little sister is really into art. The main character, who is the best friend, helps his sister set up an art show in the neighborhood. Their mutual friend, who is initially a bit intimidated by the sister's talent, eventually becomes her biggest supporter and they form a great friendship based on their shared love for creativity.
The most interesting part could be when the little sister surprises everyone. For example, if she has been seen as the quiet one but then suddenly shows great courage or talent in a particular situation. It's like a hidden side of her is revealed.
One great 'best friend's little sister' romance novel is 'The Deal' by Elle Kennedy. It has a really engaging story where the hero, Garrett, finds himself falling for his best friend's sister, Hannah. The chemistry between them is palpable and it's filled with both funny and steamy moments.
One popular 'best friends sister mate' type of novel could be 'The Summer I Turned Pretty'. It has elements of a love triangle involving the main character, her best friend's brother, and other complex relationships. The story is set in a beach - town and is full of teenage drama and romance.
Here's another story. The best friend's little sister loves animals. One day, a stray kitten gets stuck in a tree near their house. She tries to get it down but can't. The best friend and his pal see her struggle and together they manage to rescue the kitten. It becomes a beloved pet in the family, and this incident makes their friendship even stronger.
Love triangles are a common theme. For example, when a person is attracted to their best friend's sister or vice versa, it creates a complex triangle of relationships. There's often a conflict between loyalty to the best friend and the new - found romantic feelings.