from p.3 to p.104, His Mom was Offscreen for a LONG Time
p.109 SHE'S RIGHT THERE!
p.117 HE'S IMAGINING HE'S FUCKING HER!
Sorry! No Incest. From an Author Popular for such works.
And I waited Months Looking Forward To his Mother Getting Fucked (the Author strung us along and teased us with no pay-off)
The dlsite for Part 5 translated as follows: There was no threesome
"``What should I do...is it okay to cross the line...!? Mother...!'' Misa points out Haruto's recent lack of energy. She was worried about her mother coming to Haruto's room. It's Misa's chance to see Haruto's mother and Reika at the same time, and she decides to be there as well. Then, on that day, Reika, Misa, and Haruto's mother Manami appear and form a threesome..."