Demon Slayer Love and Lust

A young guy lives a modest life with his mother and sister. But one day everything changes — the mother is abducted, and the sister turns into an incredibly seductive demoness.

Now the main character must find his mother, following the path of becoming — from an ordinary guy to a master of the blade and seduction. On his way there will be training sessions, battles with lustful demons, passionate meetings with unusual girls and dangerous trials.

[From Itch.io]