Daikirai na Aitsu no Maji Piston

[MangaDex]

 

[gletto]

What the fuck? This is advanced incest

 

[mcmahon]

pretty good comedic with grand twist story.
the mc is sex nuts and passes the horny pervert genes to the descendants.

 

[Darkenning]

the mc is sex nuts and passes the horny pervert genes to the descendants.

Though not completely, as their reaction to their moms joining in again is, "Ehh?" instead of "Yay!"