It's a valentines day date night. Established relationship
Grillby is a fire elemental character from the game Undertale. In the game, he lives in Snowdin as bartender who owns the place called Grillby's, were Sans will take the child you play as.
As betrayed in a lot of fan comics and fanfictions, he's a good friend or boyfriend, a bit shy in some cases, dose not talk much until he knows the reader better, kind, smart and a gentlemanly introvert, that's not afraid to stand up for someone and even fight as a last resort if needed... also he's hot as hell!