Can't remember the name for shit, all I remember is that it's about the "last" human in a world full of succubus women and the women basically rent his cock out to other succubi.
pic unrelated
Bumping with a similar theme, a man dies and gets a succubi harem:
[Marui Maru] Tanetsuke Inferno | Mating Inferno (COMIC Unreal 2015-08 Vol. 56) [English]