They eat ice cream

Lucy goes to her fridge and pull out a huge tub of chocolate ice cream. She scoops a whole bunch of it into two bowls. "Hey Juvia, you want some ice cream?" Lucy asks. Erza/Juvia's eyes lit up. She hurried to the kitchen to get her sweet treat. "Yes please!" She said eagerly. Lucy nodded and gave her the huge bowl if chocolate ice cream.

Thirty minutes later, the two girls were sitting in their respective chairs with their hands on their full stomachs. "Oh that was so good!" Lucy exclaims. Erza/Juvia nods in agreement. Then suddenly, her stomach grumbles and she sat up in pain. Lucy noticed this, and got concerned. "Juvia, are you okay?"

It was then Erza/Juvia rememberd a conversation between her Mira and Juvia. Somewhere in the conversation, Juvia said that she couldn't have Ice cream cause she was lactose intolerant. Erza/Juvia's eyes widened and then her stomach reacted to the huge amount of ice cream she just ate....