Hentai where sex is imporntant for the plot

[kiza90]

As the title says, can someone list some hentai where sex is a part of the plot, e.g. tentacle and witches (yuuko has to have sex with the monster so he doesn't go berserk) or kagaku na yatsura (ayana has to get her boobs milked to remove the potion)

 

[Restrict]

Nekopara Vol.1
As far as I understood the nekomimis need to have sex because of the breeding/mating season..

 

[kiza90]

Thanks! definitely gonna check that out

 

[Xsemit]

As the title says, can someone list some hentai where sex is a part of the plot, e.g. tentacle and witches (yuuko has to have sex with the monster so he doesn't go berserk) or kagaku na yatsura (ayana has to get her boobs milked to remove the potion)

Ultimate Boob Wars! Small vs Big (i think this is the title) its a nukige where a guy has to gather boob energy(well by groping boobs which usually(always) leads to sex) to save the world and prevent two countries(big breast country and small chest country) from warring.

 

[dstoop22]

I know it's ancient, but La Blue Girl fits the bill. The ninja girls have to have sex to awaken their powers or something like that.

 

[kiza90]

Thanks! u just reminded me i have this game installed but i was always too lazy to play it :D also, does it come in any other form (anime,manga)?
i watched la blue girl a long time ago and it was epic! still ty tho