Ronald Laren was born in 2244. After his wife died, 33-year-old Ronald wandered the wasteland until settling in Girdershade. Living in close proximity to Sierra Petrovita has made him feel even worse about being alone. His thoughts of loneliness are not as wholesome as most would think. Basically he misses the physical side of relationships. Feeling these urges, he's made several advances upon Sierra, who is completely oblivious to his motivations, because she is absorbed in her pursuit of Nuka-Cola. Ronald mistakes Sierra's rejection as being spurned, and this has angered him a great deal. Fortunately, he doesn't want to physically force himself on her but wishes to "get even" with her in other ways.
According to Sierra, Ronald is a skilled fighter. She recalls one occasion where he killed two raiders at Girdershade and punched Lug-Nut in the face.
Should the player character have the Black Widow perk, they can convince him to fetch the Nuka-Cola Quantums for them, with the promise of a threesome with the Wanderer and Sierra. Excited, Ronald will run off to the distant Nuka-Cola plant and die. If one then asks Sierra if he's been bothering her, she'll say she hasn't seen him in a while, but she's sure he'll come back. If one is able to escort Ronald safely to the Nuka-Cola plant, then he will enter it, but remain standing just inside of the entrance.
If the Lone Wanderer simply kills Ronald themself, the previous speech option will still come up in conversation with Sierra.
If one gives the Nuka-Cola Quantums to Ronald for The Nuka-Cola Challenge, he will attempt to woo Sierra with all the subtlety of a sledgehammer, but she fails to notice his obvious innuendo-laced words and instead interprets his behavior as an imminent marriage proposal.
If one kills Sierra and speaks to Ronald, telling him she's dead will open up a variety of dialogue options. Among these are admitting to killing her and lying that the Nuka-Cola company had her assassinated.
"Fine. Oh, and I wouldn't bother running back to Sierra and warning her about our little chat. She won't even understand what you're talking about. She may be a looker, but she's a bit vacant in the smarts department."