"If you succeed in sucking the Demon Trap dry of all her(his) powers, I will give you this Rod of Inexpressibly Ultimate Supreme Magical Power wielded by the High Kings of Festeros back in the days of yore, " said the god with a 'Trust Me' look on his/her face.
"Eh, not enough." the boy crossed his arms, "In exchange for my service I want the Rod of Inexpressibly Ultimate Supreme Magical Power AND a catgirl companion that will never run away from me!!"
The boy's skin broils, his bones shatter and reallign as his soul reunites with his corpse: he has now turned into a magical loli catgirl with a Rod of Inexpressibly Ultimate Supreme Magical Power as his (her?) peepee.
While pondering whether a futanari tag was needed & wondering where to buy panties, the magical loli catgirl began searching for Demon Traps in the nearby shota boarding school.
The Demon Trap squirmed & panted when s/he caught a glimpse of the Rod of Inexpressibly Ultimate Supreme Magical Power just before the loli catgirl pulled her panties (they were pink) snug against her svelte feline booty.
The Lesser Demon Trap stealthily approached the unsuspecting loli catgirl, but before s/he could ensnare her, the busty Oneesan dorm supervisor came along and said, "Ara ara, what a cute little kitty-chan."