It's important to remember that human behavior and communication can be complex and varied, so interpreting one action in isolation may not always provide a clear answer. Biting someone's shoulder can have different meanings depending on the context and the individuals involved. It's essential to consider the broader context and the nature of your relationship to better understand the intentions behind such an action.
In some cases, biting someone's shoulder playfully or affectionately could indeed be a sign of intimacy and comfort between two people. It might be a way of showing closeness or a playful gesture that suggests a level of trust and comfort in the relationship.
However, without more context, it's challenging to definitively say whether it is a sign of affection or not. Some people might engage in playful physical interactions with friends, and it doesn't necessarily imply romantic interest.
If you're interested in someone and are unsure about their feelings or intentions, the best approach is open and honest communication. Instead of trying to decipher subtle actions, consider having a conversation with the person about your feelings and intentions. This will allow both of you to express your thoughts and emotions more clearly, leading to a better understanding of where you both stand. Communication is key in any relationship, whether it's a friendship or a romantic interest.