When the author is Japanese, the fanfiction be like :

He wrapped his arms around your waist and said "Anata wa minikuidesu".

You giggled and rested your head back against his chest, " kimi mo ".

He turned you around to face him, and confessed, " watashi wa dikku wa chaisaidesu" . You understanding nodded and replied " daijobudesu" .

I don't understand shit! I go look for translations, so that I can finally get them feels!

Translation :

[A/N] I suggest you don't read this shit.

Anata wa minikuidesu : You are ugly.

Kimi mo : You too.

Watashi wa dikku wa chaisaidesu : My dick is too small :(

Daijobudesu : It's okay.