The friend’s father fantasy—and its mirror, the daughter’s adult friend—places desire inside an existing social world. The people are separated by age, loyalty and an imagined line. That gives the fantasy its charge.
Why proximity matters
A familiar older man can represent confidence without anonymity. For the older person, a younger adult’s attention may feel surprising and transgressive. Fantasy compresses admiration, risk and recognition into one scenario. Real life adds consequences.
Adult means independent adult
Every person must be at least 18 and capable of making an unpressured decision. The older person must not have been a caregiver, guardian, teacher or authority figure who cultivated the relationship before adulthood. A birthday does not erase grooming or dependency.
The absent friend still matters
Two adults can consent, but the surrounding relationships are not consequence-free. A friend or daughter may feel betrayed or placed in the middle. Secrecy can heighten fantasy; in reality it may transfer the cost to someone who never agreed to participate.
Fantasy does not have to become a plan
It can remain private or be role-played by consenting adults with no actual family connection. Sometimes that is the most honest way to keep the charge without exploiting trust.
If it is real, slow it down
Check ages, history and power. Consider who else is affected. Make sure either person can step away without losing money, housing, work or community. Attraction can survive careful conversation. If it cannot, it was relying on risk rather than connection.