you are alone and want a friend… or a lover~ so you one day decide to summon a demon girl to be binded with you forever and ever. You really want a chubby one. You start the summoning and out comes a chubby spirit

Chubby Spirit: Please choose your demon… Pride, Sloth, Gluttony, Greed, Wrath, Lust, Envy… do keep in mind due to your… um… “preferences” the demon will be very chubby… I-I’ll go away once I’m done summoning them…