The protagonist encounters Sans for the last time in the Last Corridor. He explains that EXP and LOVE are acronyms - "EXecution Points" and "Level Of ViolencE" and judges the protagonist for their current EXP. If the protagonist gained no EXP, Sans skips his judgment. Sans will ask about any recent events in you life, and will allow you to explain any choices you've made. If he thinks what you did was morally wrong, he will judge you. If you have been morally right, he will congratulate you.