Fell POV
Fell was wondering how he will spend Valentine's Day with his new boyfriend classic sans so he decided to reserve a dinner place

~time skip~
Fell finally decided to pop the question about marrying classic sans

Classic sans
He was on the date with fell but sans was about to confess that he didn't like him anymore because he loves more  blueberry than him

Fell got into his knee and told him if he could marry him

Classic regret his request and left

(Alternate ending #1)
Classic told that he like someone else and saw fell got mad so he decided to leave and never come back

(Alternate ended #2)
Classic accepts the wedding and got married afterwards