On The Bold and the Beautiful, the line of morality can be a thin one, and characters that are seemingly the epitome of integrity can easily slip into the depths of darkness, and vice versa. Although Luna is currently locked away in prison for a reign of brutality across Los Angeles, and Steffy is one of her victims, it's difficult to ignore some of the similarities that exist. While Steffy isn't as inherently evil as her stepdaughter, parallels still exist between the women.
They both love The Bold and the Beautiful's Spencer men

Steffy's (Jacqueline MacInnes Wood) attraction to the Spencer men has always been her undoing in some capacity. She loved Liam (Scott Clifton) (and had his children), toyed with a future with Wyatt (Darin Brooks), and gave in to the temptation of Dollar Bill (Don Diamont). Something about the allure and power of the Spencer men has drawn her in over the years, something Luna (Lisa Yamada) has recently found for herself.
At first, it seemed as if Luna's entanglement with the Spencer men would not go further than a daughterly bond with Bill, but once she set her sights on Will (Crew Morrow), everything changed. Luna dove directly into darkness, and her attraction to the youngest Spencer son led to her sexually assaulting him, which resulted in a forbidden pregnancy. While Steffy gave in to temptation on more than one occasion with the Spencers, Luna crossed lines that Steffy never would.
If there's anything the bloodlines of the Forresters and Nozawas have, it's the recurring desire to secure a Spencer man. Whether it's the danger wrapped in devotion or control disguised as protection, there's something enticing that can't be stopped. Steffy never loved a Spencer without losing part of herself in the process, but Luna controlled the situation and used manipulation tactics to possess Will's future in the form of a child.
Both have shown varying levels of violence

Another area where both Steffy and Luna are similar is their predisposition to commit violent acts. Viewers have witnessed both women resort to deadly violence on different occasions, and despite the difference in circumstances, both are capable of it. Steffy's violence has typically been presented as reactionary and stemming from a need to survive. She's often desperate, dodging threats from wildcards like Luna or Sheila (Kimberlin Brown), or she's in protective mode, wearing an outfit of maternal armor to defend her family.
Luna, on the other hand, commits intentional and calculated violence. Unlike Steffy, Luna isn't coming from a place of protection. She makes premeditated choices, and her violence sends a message that she cannot be controlled. Shooting Liam and Sheila is a prime example of this. She lets her darkness breathe instead of locking it away for moments of desperation. Steffy watched her mother, Taylor (Rebecca Budig), and Brooke (Katherine Kelly Lang) wage war against each other, which showcased love as a battlefield. Luna, however, was raised on silence and secrecy, left to her own devices while Poppy (Romy Park) pursued questionable prospects.
Steffy typically learns from her moments of violence and uses them as personal turning points. She searches for redemption amongst the chaos, and eventually, she seeks peace and tranquility. Luna is an entirely different story. Every heinous act seems to energize Luna and breathe new life. Destruction is an aphrodisiac, and she's most empowered when she's plotting a new manipulation. Like her grandmother, Sheila, Luna is both terrifying and fascinating.
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