5th house is about progeny, children, artistic talent, creative self-expression, self-confident, tantra-mantra, higher education, learning, sports, romance, investment, risk tking abilities, lottery, gambling, etc …
Let’s understand how the 8th house can bring happiness for the 5th house things.
Your inheritance property /wealth (8th House)is the happiness of your children (5th House)
When there is a sudden gain (8th house)through gambling, investment your become more confident regarding your investment (5th house)
Your transformation period/ ups and downs of life make you a better/confident/intelligent person
Your sexual intercourse (8th house) increases the romantic inclination (5th house )in life.
Whatever profit you are getting through your secret work, you mostly used it for your entertainment/creativity…