I got you little bro
https://snowmtl.ru/reader/i-think-my-friend-will-become-the-demon-lord/31?lang=en
Uh 3 years pass he goes finds the ML it's hella easy bro literally finds him day 1
Ml kidnaps him back to the demon world or whatever cause he been knew since the start the mc would be brought back as the hero
ML & mc had a lot of sex scenes and then they gotta social distance cause ML being the demon king makes his instincts go crazy when next to his natural enemy ( hero)
Yadah yadah they get married whooo

Thank you for the person who sent a link to the complete translation I loved it so much
Some people complain about the writing but bro for a person who barely has the patience for slow burn this is so refreshing, like YEAH speak your mind if you think you're misunderstanding smth why not ask directly and get the answer
Really cute ending too