Kissing between siblings is generally considered socially and culturally inappropriate in many societies. In most cultures, there is a strong taboo against romantic or sexual interactions between siblings due to the recognition of the importance of maintaining healthy boundaries within family relationships.
The idea behind these norms is to preserve the family dynamic and ensure that relationships within the family are based on love, care, and support, rather than romantic or sexual feelings. Romantic or sexual interactions between siblings can lead to emotional complications, conflicts within the family, and may even be illegal in some jurisdictions.
It's crucial to respect societal norms and boundaries, as they are designed to promote healthy relationships and maintain social cohesion. Instead of focusing on physical displays of affection between siblings, it's more appropriate to nurture strong emotional bonds and support each other in ways that are consistent with appropriate familial relationships.