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After returning to West City, Broly didn't run off all over the place this time. Instead, he spent a calm, peaceful five years with Bulma and Launch.
Five years later, Broly was almost eighteen. During the first couple of months, Bulma had already noticed something off between Broly and Launch. Whether it was because of her own hopeless feelings for Broly, or her sympathy for Launch's unfortunate past—and maybe the growing friendship between the two women—or maybe a mix of everything, Bulma ended up quietly accepting it. She went along with Broly's feelings, and about a year later, Broly finally "won over" Launch. Of course, they only confirmed their relationship. Not the kind of stuff you're imagining.
Broly understood exactly how deeply Bulma cared about him. Letting another woman share the man she loved was a huge sacrifice, and she did it only because she knew she couldn't live without this "little man" anymore.
That made Broly treasure her even more. Holding Bulma's now fully-developed, curvy body, he swore to himself: No matter what happens in the future, Bulma will always come first. No one gets to bully her except me.
During these five years, Broly kept teasing the girls on a daily basis. Like that one time when Launch sneezed and switched to her violent blonde persona, scaring Bulma half to death and nearly wrecking the entire house. Broly finally had enough and "disciplined" her hard. Blonde Launch stood there afterward, glaring at him fiercely, eyes burning like she wanted to set him on fire.
Ever since then, whenever Blonde Launch made trouble, Broly would "deal with her" again. And every single time after he finished disciplining her, Broly couldn't help thinking, "Huh… her butt and her chest definitely grew again since last time." Somehow, Blonde Launch seemed to have a bit of a masochistic streak. The rougher Broly was with her, the more excited she got. More than once, Broly realized this girl was absolutely causing trouble on purpose just to get "punished" by him.
Aside from messing with girls every day, Broly spent almost all his remaining time training his body. After returning from King Kai's planet five years ago, he spent a week repairing the slight damage caused by training under that extreme gravity. From then on, he pushed his body harder and harder every day. Now, Broly's physical strength had reached a downright frightening level.
He had poured almost all his time into increasing the durability and raw toughness of his body. Even the colorless energy created when he decomposed his Demon Ray was used entirely to nurture and polish his physique. He didn't deliberately raise his "power level," but with his monstrous strength, insane endurance, extreme toughness, surging vitality and overwhelmingly strong Saiyan body, his combat strength still reached more than 9,000. Just a thousand more and he'd hit 10,000—the threshold for awakening the Legendary Super Saiyan bloodline.
And that was with him holding back on purpose. Under Erha's advice, Broly decided not to break past 10,000 yet. He chose to push his body to its absolute limit first. After that, he'd absorb ten large Spirit Tree Fruits to replenish the energy that had been drained years ago when the system absorbed most of the latent Legendary Super Saiyan energy and put it into deep sleep. Only then would he awaken the bloodline.
With all that accumulated, the moment he broke 10,000 and awakened the bloodline would be the moment Broly rose up. His power would erupt like a volcano, and he'd be able to fully control the violent force that came with being a Legendary Super Saiyan.
"....."