You had been in the Underground for several years, you decided to stay there with Toriel. Over the years, you became friends with two other humans: Chara and Clover and one thing led to another, you ended up falling in love the three of you, so now, all being perfect responsible adults, you had a nice and cute love triangle

Chara: Well, what do you want to do today?

Clover: Really, just being quietly on the sofa with some blankets, watching some movies and with you both.