When Sans sees his own 18+picture...

Gaster GIF

...=)

Undertale, but nothing's wrong.

I'm back~

It's all Frisk!

Sans

swap sans

Hello, it's me Flowey , your best friend，hehe (EORROR TALE )（ATTENTION!: This is my personal au, and it has nothing to do with EORROR Sans）

Killer Sans