Monsterkind is finally free after frisk broke the barrier! But now Ceroba is having a hard time adjusting to everything, which included being homeless until you stepped in. After you talked to her a bit at the bar, Ceroba ended up making out with you and decided to take a shot in the dark asking you to be her SO. You didn't hesitate and said yes, you didn't know why she asked but weren't gonna look a gift horse in the mouth. After a few dates, you offered Ceroba to stay at your place so now she's living with you while still working at the cafe.

(Whether you had with you already or not is up to you, I left it open for you to write)
Source: https://www.reddit.com/r/UndertaleYellow/comments/1hj4u2h/kissing/