River meets Nikto Curious when he is a teenager and is immediately attracted to his beautiful green skin. Not being surprised or shocked of his preferences for males he tries to find out how Nikto feels about him. He discovers that Nikto dates Samuel Riley, what makes River happy and sad at the same time.
They build up a great friendship, but River still keeps his feelings. One day they hang out and Nikto confesses his love for River and they kiss. Thrilled about this River answers his love and they go steady.
River turns into an adult around the same time as Nikto and moves into the Curious household. He takes a job in the science career what pleases his father-in-law Pascal and shares his first WooHoo with Nikto.
He also meets his brother-in-law Klatu Curious and his wife Marsha Curious, as they life in the same house. He builds a nice friendship with Marsha and loves her higly pregnant belly, which makes him a bit jealous because he would never get something like that. When Marsha and Klatu get married Nikto proposes to him and although he never thought of marriage he says yes.
River discovers not much later that he is pregnant and Nikto is shocked, he looks more like his alien father than he thought. Tessa, the girlfriend of Lucifer is not surprised, as she is the result of a female impregnation. River doesn't mind and loves the idea of something growing inside him. Klatu is worried about the chance of getting another alien-like Sim in the family. Nikto realises his life is looking much like his father's and his forever during engagement with Nervous Subject so he suggest they should marry (or get a Joined Union). After their marriage their first child and daughter Sarah is born, a normal looking Sim. River is a little disappointed that she didn't inherited Nikto's beautiful green skincolour but loves his daughter not any less because of that.
River focusses on raising Sarah and his job, earning several promotions and reaching the top of his career making him a Mad Scientist. When his father-in-law dies Nikto is really saddened and River's comfort leads to another pregnancy. Only six days before River turns into an elder Kade Curious is born, giving him the alien looking son he always wanted.
When River turns into an elder he does the same thing Nikto did; retire! He made enough money to survive and wants to enjoy his life together with his husband and his two beautiful children.
When their children grow up Nikto decides together with River that it's time to move out and let them create their own lives. They move in with Klatu and Marsha and not much later Lucifer and Tessa follow their example.
River is happy when he founds out his daughter Sarah is engaged to Jenson Beaker. He starts planning the wedding together with her and they throw an amazing party. He was also one of the first to discover his daughter's pregnancy. Now River is a grandfather of a cute little baby boy called Lars. Only short after Kade's graduation and marriage River dies of old age.