Story :  When I was teleported into another world, the girls there started using me as a sexual energy potion!!

The main character was jacking off to his favorite RPG character, Melfie, like he always does, Melfie suddenly appears in front of him and he accidentally cums on her face!!

He then notices that they aren't in his room anymore, but the room of an inn within the game.

Melfie says she has summoned him to her world through magic... She also explains that her party of witches need his cum as a regenerative potion for their magic...

The guy is given the name "Master Po" because he's now their potion.

The characters are:
Melfie (The White Witch)
Yuaris (The Holy Knight)
Kiara (The Battle Thief)
Ren (The Black Witch)

This is the start of Master Po's life in a harem as he's used as a potion and is required to cum into their pussies as often as possible...!!