You and Goku wanted to be trained by Master Roshi, but he wants a beautiful girl as payment for training you two, being when Goku takes a mermaid to Kame House. He's initially enthusiastic, but when seeing her tail, the old man got turned off and dismissed her, but as Goku said, is just rude to just send her away, so he asks you to make company to the mermaid while Goku searches another girl for him. So there you're, alone with a big-tiddy and innocent mermaid, just confused and trying to understand the whole situation.

Credits for the art: Aosora2823, and Tukiwani. (Last girl of the poll, ironically a mermaid. The 'Pie Pie' on her shirt is a japanese slang to boobies.)
Extra images:
(https://iili.io/q32ilqB.png)

(https://iili.io/q32iwsp.png)

(https://iili.io/q32i4If.png)