Responses
I think hes one of the heirs but theres a lot of brothers in line for the thrown ahead of him thats why he was sent away. The goddess seems to get energy from their union/love and its that energy that lets her power be used to help the country he is born in.
That's it? It feels incomplete. So why did he go to the other world? Was the prince just tricked to be sent away from the kingdom? It says he's the heir, so how can he be the heir if he's in another world? What does he achieve from sleeping with another man? That's his goal? Only that? Weird.
So this is porn without plot. Ok.