How Are You So Big?

Choi I-seo and Han Jungwoo have been childhood friends for 25 years. Jungwoo has had a crush on I-seo for ages, but I-seo doesn’t see Jungwoo as anything more than a friend.
One day, due to certain circumstances, they start living together…
“Hey, how are you so big?”
“I told you, I’m way bigger than your toys.”
Are they crossing the line that friends shouldn’t cross?!
“You’re putting it in? I don’t think it will fit.”
“Oh, I-seo, you’ll be wet enough for it to fit.”