Yes, it's definitely possible for a guy who initially calls your sister to eventually develop feelings for you.
According to the reference provided, feelings can change over time. What might have started as platonic or brotherly feelings can evolve into something romantic, especially as people mature. The reference highlights that romances can blossom from friendships.
Here’s a breakdown:
- Changing Feelings: People's feelings are not static. A person's attraction and interest can shift as they get to know someone better.
- Friendship as a Foundation: The best romances often grow from a solid foundation of friendship. His connection with your sister may have inadvertently introduced him to you, allowing a friendship to develop.
- Maturity: As both of you get older, his perception of you might change, leading to romantic feelings.
- Opportunity: His existing connection with your sister means he is already in your life and has the opportunity to interact with you. This increased exposure can certainly lead to attraction.