Source: https://www.dlsite.com/maniax/work/=/product_id/RJ235238.html

The mc son his mother is trying to make a living but her life isnt going great she thinks nobody wants to marry her cause she was raped when she was young and had a son born out of it meanwhile her son uses his real mother as his sex slave there is some sharing witch i dith not like in witch the mc and his friends switch moms but they have a deal to not cum inside each others moms then judging by the dealogue and art the son knocked his mom up in the last picuture she seen pregnant taking leave or work incest saves it again.

if sombody can read those last pages better then me then leave a comment google translate is not realy good from japanese to english