My Magic Assistant (Whether You Like it or Not!)

Having been dumped by his longtime girlfriend, a young man sets out to soothe his sorrows with a one-night stand. But when he sets his sights on the lonely looking goth girl at the bar, his poor manners find him plunged into a magical world he never knew existed... womanhood!

Revealing herself to be a real life witch, the would-be rebound girl gives him (now her) a choice: Become the assistant to her magic show routine, or remain a busty bombshell babe forever!

[From Steam]