Goku had been training with Broly for a couple months on planet Vampa. Goku helped Broly to have more control over his power and new techniques. Broly gave Goku very challenging sparring sessions. In an ironic turn of events, Goku was also teaching some social skills (emphasis is some. After all, it's Goku) to Broly so he could introduce him to the other z fighters on earth. Broly was a kind soul that meant well but did not know how to socialize properly since he lived isolated for most of his life. Goku remembered that Master Roshi did more than just train his body, so he did his best to teach Broly a couple of things like using utensils, taking baths and practicing conversation. Chichi would have been proud to see Goku teaching something other than fighting.
Time flew by and Goku decided to take a break to visit his family. Goku invited Broly and his friends, Cheelah and Lemo to go to Mt. Paoz with him. Cheelah and Lemo declined the invitation to use the time to get some supplies and fuel for the spaceship. Goku promised to bring back some deserts for them since they were going to skip the trip to Earth.
Broly was nervous about travelling with Goku since he had never been out of Vampa. Except for that time that Freeza took him to earth to kill Vegeta and Goku, but he got beat up, Freeza killed his father so he could go super and he almost ended up killed. Also he grew close to Cheelah and Lemo, it was going to be his first time apart from them. They were his first friends that liked him for who he was and wanted nothing from him in exchange.
Goku always told Broly that Earth was a beautiful place full of delicious food and nice people. Broly was curious to see this world and meet Goku's friends. Goku teletransported himself and Broly to Mt. Paoz and surprised Chichi in the kitchen of his home.
Goku: Hi Chichi! I am home.
Chichi: Oh Goku! Don't scare me like that!
Goku: Sorry babe! I should get a bell or something to not scare you.
Chichi: Welcome home honey. I was not expecting you for a couple of more hours. Lunch is still in the oven. And you must be Broly. It is so great to finally meet you. Please make yourself at home.
Chichi being warm and welcoming to Goku's friends was very unusual. Goku told Chichi Broly's life story. When Goku finished telling her the story, Chichi was in tears. It was cruel that the child was separated from his family and sent to live on his own to an isolated planet and then his dad treated him not like a son, but like a weapon. Chichi wanted to make Broly's visit special and make sure he enjoyed his little Earth vacation.
Broly: Hello miss.
Chichi: We are very happy to have you home with us. I hope you enjoy Mt Paoz. I am making a special lunch. You guys must be hungry. I know that saiyan appetite.
Broly was blushing with all the attention and kind words.
Broly: Thank you, miss.
She had a big warm smile that made Broly feel happy for some reason. It was the first time he had been invited somewhere and was received with so much kindness.
Chichi: Let me show you the guest room. Lucky for you my father is a bit of a giant so we have this long bed for him that you can use. Also there are some clothes in the dresser. You are on vacation and should not be wearing those combat clothes. Drop those clothes in the hamper and I will wash them for you. The same goes for you Goku.
Goku tried to interrupt Chichi since Broly was very attached to the green wrap (his first friend's ear) around his waist. But it was too late, Chichi was being her usual self using her commanding voice. Firm but sweet. Broly surprisingly reacted well and obeyed Chichi. He was used to strong women, since the only woman he knew was Cheelah, but there was something different about Chichi. It felt that she was in charge. He sensed she had a low power level, but she felt so powerful. Her tone was strict, but caring at the same time. Broly was confused by Chichi but liked her. He thought she was very pretty too.
Chichi: I hope you like these clothes. Goten picked them for you. He is so excited to meet you.
Goku: Oh Chichi, I would love one of your baths. We have been training so hard that my muscles need some relaxing.
Chichi: Broly, I will have a bath ready for you in a few minutes. Goku, show Broly the bathroom.
Goku: Sure. What about my bath?
Chichi: You can heat up water for the barrel outside. I can't help you. I have to finish cooking. Plus we need to make sure our guest is ready for lunch, so help Broly out.
Goku: But Chichi...
Chichi: ...I don't wanna hear it
Chichi left the room and Goku followed was used to Chichi preparing his bath in giving him all her attention when he came back from training. Chichi looked at his puppy eyes and said " I will take care of your muscles later" and winked. Goku smiled and said "You are the best. I missed you". He knew exactly what was going to happen that night once everyone went to bed. It was going to be better than a hot bath. They shared a little kiss to seal the promise of the muscle caring for later.
Goku went back to see Broly. He was naked as per Chichi's instructions.
Goku: Hey man, let's get you a towel. Chichi does not approve of lounging clothless. Believe me, I have been there.
Broly: I was not lounging. Please forgive me. I do not want to offend your friend.
Goku: No worries, man! Following me to the bathroom. You are going to love it. Just use the soap and shampoo like I showed you. Call me if you need me. I will be taking a bath outside.
Broly: I am sorry your friend did not want to have a bath for you. You can take this one. I can bath outside.
Goku: No way. Chichi made this bath for you. Just enjoy it. Make sure to massage your muscles in the hot water. Really, no worries. 'She will massage my muscles' he thought.
Broli was grateful for the hot bath. He had never experienced anything like that. He thought that Chichi was very kind and Goku was lucky to have a friend like her.