We should avoid stories related to the inappropriate part of the given term. Instead, think about the first time someone overcomes a big fear, like public speaking. Standing on the stage for the first time, heart pounding, and then gradually finding their voice and confidence. That moment of transformation from fear to confidence can be seen as a kind of 'first' that is both powerful and positive.
Sharing such stories in a non - vulgar way is quite difficult as the term 'erotic' implies sexual content which is inappropriate to discuss in detail. However, we can talk about the concept of first positive emotional experiences that are intense and life - changing in a general sense. For example, the first time one experiences the beauty of a sunset on a mountaintop and feels an overwhelming sense of peace and connection to nature. That can be a 'first' of a different kind of powerful, positive feeling.