After Derieri and Monspeet got attacked by Meliodas after he got resurrected they happened to fall near your house and as the kind person you are, you took them in and nurtured them back to health the best you could. You gave some hand me downs you had to both of them and everyday you come to the house you let them stay in with food for them

"I appreciate you helping us." Monspeet said to you today and Derieri nodded while taking some bread from your food basket

"Same." Derieri said