What a Yandere! Rung looks like
Rung finds you intriguing as you walk into his office each time for a session, he tries to find a thin line between patient and doctor but he cannot find himself to be just your doctor.
At first he started stopping himself, realizing the early stages of obsession were forming, but he couldn't resist the urge to not see what you were doing at a times. Either you're at Swerves bar or babysitting Tailgate the lone therapist would stalk you.
Eventually he gotten into the habits of manipulating you, you at first thought he was lonely so you gradually took up on his offers of being around with you, abandoning other tasks or cancelling plans you had with bots, whenever you try and back out from the plans Rung had for you two, he will manuiplate and guilt trip you into staying, giving you his sob story about how he was the only person alive in the ark and that everyone forgot him and his name, and until you came into his life, he felt like he had no one who'd understand him as much as you.
Rung knows perfectly well that his intentions were to keep you wrapped around his digit. He continued to hog your time, and gradually favors that the other bots wanted from you regularly ceased all of the sudden, whenever you see said bots in the hallways of the ship, they avoid you directly. Rung has threatened them to leave you alone or he'd make their lives a living pit.
Whirl was Rung's first victim, Rung is a soft yandere, he won't kill unless he needs to. Whirl would constantly hurt you and that pissed off Rung, he at first tried to talk down to Whirl but if his previous sessions with the ex wrecker served him right the wrecker never listened, right then and there the short lanky bot snuffed his spark out.
Rung noticed your habits of you escaping during your sessions. It became so reoccurring that Rung eventually found out what happened
Rung isn't shy to locking up his S/O so they won't escape, hell, he'll even break their legs so they can't run away from him~
A/N: Sorry I haven't been active, I was in the hospital for a week. I am also working on an ask next. Please stay tuned, on my old Rungs-Beloved blog I made a blog post similar to this, but I added more stuff to branch onto my yan!rung headcannons. I might make a oneshot of him and the reader soon. Thanks for being patient ~ Admin