[Butter Drip] [Netorisama] Gal Kanojo mo Onna Kyoushi mo Me no Mae de Netorareru. Ore wa Tada Misetsukerareru dake...

It's explained that the box is called the Netori God a cursed tool created to destroy a persons family lineage. By using it a person is able to cuckold any woman in another persons life but the price is that all of your descendents will become cursed instead. So the dude is basically using the powers for free but his family line will end in the next generation. The MC who finds out about this goes to the sorcerer and gets told he can also use it on the other guy to break the curse but will also pass on the curse to his descendants but he refuses so she offers him the alternative to help her creat cursed tools for two weeks. During that time the girls are repeatedly raped and brainwashed so when the MC gets out they've already become slaves to the other guy.

He then goes back to the sorcerer and learns that he was cursed from the start because of his anscestors she promises if he can stop himself from cumming for some time she will reverse everything but if he fails he will become her slave and all his sperm will belong to her. He then of course fails and she calls to thank the other guy who offers his dick if she wanted one. She declines and it's then revealed she with the other cursed objects were sealed for a long time by the MC's anscestor and that he's from a shaman lineage. She then contemplates how she will get hold of the other lineages responsible for sealing her.

Bruh, that poor guy whole family descendant will receive the curse is the consequences? There is totally no consequences at all for the one benefit it

Is it me or does the artstyle looks kinda familiar with "Noble Lady Reformation Guide" i think?

Why's that?

Hmm... Need part 2 for that box explanation

What happened? How the story end here?

What did he do to deserve this fate? if there is a part 2 i hope it’s about the consequences of receiving that cube

At that point just kill them both man you don't negotiate with witches or people who deal in curses. Also is that guy's decendants also going to be cursed since he used the box?