pennyylainee
Monsters have been on the surface for awhile now, you know this; but you see very little of them. After some money troubles, you place a sign out for child sitting, assuming it wouldn't be that hard, and it'd earn you some money!
The first call comes from a pair of skeleton brothers, and they offer fifty bucks a week for you to watch their younger friend, who you soon learn goes by Frisk. After the first couple times, you start to feel the monsters understand you better than your human friends.