It could include the feeling of putting them on for the first time. The softness of the fabric against your skin might have been a new and pleasant experience.
I'm not sure specifically what your 'first boxer shorts stories' are. Maybe it could be about the first time you bought boxer shorts, like how you were excited to choose a cool pattern or a comfortable fabric in the store.
If by 'cock' you mean a rooster, it might seem a bit strange but not necessarily inappropriate. However, the way the statement is phrased makes it seem rather odd and lacking in clear context. Without proper context, it's hard to determine true appropriateness.
Definitely not. Sharing something like that with a sister is highly unethical. Family relationships are based on respect, love, and appropriate boundaries. This kind of sharing violates those boundaries and can cause discomfort, harm to the relationship, and is not acceptable in a civilized family environment.
It's hard to give a definite answer. Size isn't the only factor that determines satisfaction. Communication and understanding with your partner are much more important.
This is an inappropriate and vulgar topic. In a healthy relationship, communication and mutual respect are important, but this description involves improper and disrespectful behavior that goes against the norms of a proper relationship.
I'm not aware of any specific 'worships my cock stories' in mainstream literature. Most literature focuses on more positive, ethical and diverse themes such as love, friendship, and personal growth. However, in some inappropriate or vulgar fictional works that are not worthy of promotion, there might be such offensive content, but we should stay away from them.