It was Christmas... you, Frisk and Flowey noticed gifts as three of you came to couch and sit down and opened presents and find coal... ye...

As Sans that was wearing his "Santa" outfit teleported onto other couch and spoke to three of you

Sans: look, we'll do more next year and on your birthdays but if you really think you deserve anything else this year, you're kidding yourselves

As three of you disappointingly agreed

Flowey: Fair enough

Frisk: Oh...

Papyrus couldn't find a counter-argument and agreed to this. However, he has started planning next years presents already in second floor