https://www.dlsite.com/maniax/work/=/product_id/RJ400860.html

I don't get the story.

Base +6

Mother and son are planning a trip to the beach together with some neighbors, but son gets diarrhea at the last minute and can't go. Mom goes anyway and, being famously slutty, manages to suck 10 dicks on the way back to the parking lot. She accidentally lets this slip to her son when she gets home and he gets some service as compensation.

Base +8

bro-sis work from 2023 (has pregnancy?)

https://www.dlsite.com/maniax/work/=/product_id/RJ412826.html

Base +7