Side stories are truly heinous shit.
Side story 1 gives a backstory about Logan. Logan is truly the devils spawn. He killed a sibling prior to the twins and was going to kill the twins but when he saw illodel he was like yeah I’d hit that, so he let them live.
Side 2 illodel is living his best lemon farmer life when he is suddenly surprised with the two babies he thought were dead. Twins are identical to illodel the father is never confirmed in the novel but hinted that each twin is naturally drawn to a different brother.
Side story 3 mom sends a painter to make a portrait of illodel. Illodel tells the brothers they should sleep separately cause he kinda doesn’t want every bitch on earth to know he’s fucking his bros. Brothers think that’s it’s because he found out THEYVE BEEN HIM EVERYNIGHT . I guess the very site of illodel holding their semen demons sends them into a rut so they been drugging him and taking turns hitting that. Illodel is not even fazed at this point he’s just like huh so that’s why my backs been hurting. Then they have consensual??? sex
Last side the bros go on vacation up north and while they’re there illodel finally admits that he can’t live without them and loves them so now they locked in fr. Mom is like you do you I support you or whatever let me know if you want them dead someday and steals husbands car beats the shit out of him and goes to fuck off with her side chick.

This is a new low for me.
So they’re full sibling in the novel, terrible I know :) Logan has been obsessed with illodel since he was born, told his dad that he dreamed of rapping him every night so he enlisted in the army. How thoughtful.
So leaving off at chapter 15 the brother get together and illodel. They just keeping sexually harassing him until the mom and dad come to visit. Mom is That Bitch TM and will ho down throw down anybody. Illodel is her baby. Logan threatens to kill their parents if they try to come between them so illodel hides what’s going on from the mom. Dad been knew since Logan confessed and doesn’t gaf he is a wife simp and doesn’t care as long as the mom doesn’t know. Parents came to announce a potential engagement between illodel and crown princess. At the engagement ball the brothers kiss illodel in front of everyone and announce the only engagement is between them. Then they illodel some more.
Illodel gets up to trouble and the brothers confine him, and they find out he’s preggo. Illodel tries to yeetus the fetus but almost dies because the drug was too strong. Screaming crying throwing up mom walks in as illodel lays half dead and she takes him to her lesbian lover who’s a doctor. He survives cause the fruit uterus??? Absorbs the poison and they remove it.
Mom tried to take illodel north to get away from the brothers. Of course Logan don’t play like that and arranges for illodel to get kidnapped by savages. Deal would be he get to rescue illodel and he wouldn’t kill them. But some die anyway and so they dump illodel on a deserted island to die. Illodel is hashtag done with this shit figures out the brothers plot and is just like cool guess I’ll die here. But due to the twin bond the brothers find and rescue him. Illodel is like fine whatever im going to become a lemon tree farmer at home yall can hang I guess. Main story ends with plot twist when they took the uterus fruit out they put in an incubator surprise there’s twin babies now.
All in all 6/10 not the worst incest I’ve read. Manhwa seems to be diverging a bit def more sex than in the novel. Can go into side stories if desired.