Kanaete! Geniya-chan!!

Synopsis

Kenichi Nishikasai is a 31 year old man but with a body of a middle schooler. While trying his new onahole a beautiful lady genie appears, she is actually a demon trapped by gods she angered. He has 3 wishes to make, before his soul is taken away. Read as he wastes his wishes for his soul. (Source: MangaDex)