She had a girl-talk

"How are you feeling?" asked Diane.
"I'm alright, Sir Meliodas gave me a lot of medicine and helped me out"
"I heard from King that there was a problem with a balm?" King didn't tell her the whole story, he just accidentally let it slip and tried to deny everything afterwards.
Elizabeth's face got red.
"Well, there was no problem with the balm..."
Now Diane got even more curious. There was something that Elizabeth was hiding and she had to find out what it was.
"What happened then?"
"Nothing serious, Sir Meliodas just helped me apply it, that's all..." she hoped that Diane would stop asking. Now.
"Don't you have to apply it on the chest and back?" Something in Diane's voice changed and her heartbeat got faster as well, Elizabeth could feel it clearly.
"The back and shoulders and " she almost didn't dare to say it "Cleavage"
Diane clenched her fists. "Cleavage" she repeated.
"But there was no reason for him to help you there, right? You can reach that place on your own. Isn't that so?" her speaking was blunt. You could hear her being in rage clearly.
"To be honest, I let him do it ..."
"Why would you do that!" she was yelling now.
"First, he said it was kind of a punishment but actually I ... oh Diane, please don't get angry..." Elizabeth couldn't continue this sentence. She was scared that Diane would become even more furious.
Only now Diane realized that she was scaring the princess. She apologized immediately to her and walked out of town so that they could talk without being disturbed, or rather, without disturbing anyone.
"Tell me, I won't be mad. I'm sorry for yelling at you"
Elizabeth though about this for a second.
"What I wanted to say was, that I didn't dislike the thought that he would do it and so I even asked him to help me out ..." her face was red now as she tried to explain it to the Sin of Envy. The giantess cheeks got red as well. So this was the kind of girl-talk they would be having now.
"So, how was it?"
Elizabeth blushed even more now but Diane insisted on having her question answered.
"To be honest, it was fantastic... I never really felt anything similar to that before"
"But ... wasn't he just rubbing balm on your chest?"
Elizabeth corrected her. It wasn't her chest but her cleavage. This was an important detail to her.
"It ended up being more of a massage than just applying balm"
Diane was trying to imagine the whole scenario in her head.

Meliodas, half naked, with his defined muscles, applying balm on his palms and rubbing it. He looks at Elizabeth and Elizabeth in naked, sitting on her legs on the bed and hiding her breasts with her crossed arms. "Be gentle" she would be saying. He is caressing her back from behind and is slowly moving towards her shoulders and then to her cleavage. But Meliodas is being Meliodas and starts groping her bare breasts.

Diane flinched. She hoped it didn't happen that way but it seemed realistic.
"Did he touch you inappropriately?" she asked raising her voice.
Elizabeth flinched as well now and just didn't want to think of what Diane might be thinking.
"No, he didn't"
The princess heard a sigh of relieve.
"I'm glad... otherwise I would have to hit him"
Elizabeth twitched.
"You can't tell Sir Meliodas that I told you this!" she yelled, begging the giantess.
Diane was not happy about this but she accepted. But if she didn't, then maybe Elizabeth wouldn't tell her things like that anymore. Also, now they had to share a secret and wasn't that what girls were supposed to do?
"I won't, you can count on me" she said and clenched a fist.
"Lets head back to the Boar Hat for now" suggested the brunette.
Elizabeth agreed and Diane stood up and hit the road.

Meanwhile at the Boar Hat, Meliodas was about to close the pub. He only waited for the last few customers to finish their ale. He heard Diane approaching them and was glad that Elizabeth would come home any minute.
As the pub was finally empty, the blond went upstairs. He entered the room without knocking and found Elizabeth on the bed, buttoning up her nightdress.
"Oh, sorry, I should have knocked" he apologized but entered anyway.
"Its okay, hello ,Sir Meliodas" she gave him a smile and he smiled back.
"How was your trip?" he asked her.
"Very nice, Diane and I had lots of fun" she wouldn't tell him the details but he also didn't want to know.
"And how was your day?"
"It was good, we earned a lot of money, we should get a day off soon" he announced and put his fists proudly on his waist.
"Sounds good to me"
The princess wouldn't mind spending a free day with Meliodas together. She could already imagine them doing a lot of fun things alone.