[Chotto B-sen] Haikei Shinyuu e, Kimi no Hahaoya o Rape Sasete Itadakimashita.

the guy A got a letter from his friend B saying he raped his mom the guy in the doujin is the sons friend B and his mom. so the A's friend was kicked out of the house cos he had fight with his parents and he went to the woman who is A's mom pleading let him stay one night at there house cos he alway admired A's mom one thing lead to another B started getting aroused by seeing A's mom eventually raped her coming inside her at last part of letter he said that the child could his or bf of his mom but wasnt sure he wrote this letter just to brag and make A jealous. the mom is very timid and idiot so she let the B go without any consiquences and B is in abroad somewhere and A is devastated and tore the letter out of anger.