No matter what your problems the solution is simply a stick and a hole, money problem? Don't worry got the stick inside your hole, are you confused wether your gay or not? Try the stick inside your hole! Finally love quarrel? Easy stick in the hole! Oh are having nightmare? No prob put the stick inside the hole
I believe vaginal canal was just part of male omega genital, perhaps it's like female vaginal canal but for male omega the muscular canal extends from their anus (for female it's vulva) to the neck of their uterus (remember this is omegaverse story where men can get pregnant) so basically this canal is a passage to male omega's uterus or it was actually just rectum canal....?
There's 1 thing that i can think of the whole time reading this manga:
Certified lover mode
Certified lover boy
Certified pedophile
Woop woop woop woop woop