Tough Guy In Baby Love - Westermarck Effect - Heroine Romance

So as I've previously said, I love Tough Guy In Baby Love - Heroine Romance, https://www.quotev.com/story/14139042/Tough-Guy-in-Baby-Love-Heroine-Romance-Tough-Guy-In-Baby-Love-Heroine-Romance

One type of Tough Guy In Baby Love - Heroine Romance I'm crazy about is Westermarck Effect. The Masculine Hunk either spent at least the first few years of his life as an only child and then a new sister comes along, or as a man he discovers he has an unknown kid sister, or he was raised in a familial isolated environment where nature pulls him toward his sister whether he was raised with her or not, or he has feelings for his step, foster, or adopted sister.

​​​​​​​ In any case he's so in love with her she's of more importance to him than just a sister and he is in some way her protector.