hmm, if you're find with novels too (can be found on NovelUpdates), Runaway Guide (slow romance, M-preg, politics, sci-fi),
A Guide to Raising your Natural Enemy (m-preg, sci-fi, heavy fluff, cute buns).
The Reader and the Protagonist Definitely have to be in True Love (fantasy, transported into a book. (MC does love ML and they are consensual most of the time, just one aphroditic scene, so not completely R free)
Quickly Wear the Face of the Devil (world hopping, really great story, Jack of all trades MC, but snu snu are fade to black...)
Grandmaster of Demonic Cultivation (slow romance, and has a manhwa, must read if you haven't already)
You can also use the Series Finder in Novel Updates to sort by genre and tags to exclude R.
as for manhwa / manga series, there is a list on this site called "Consent is key bro (NO RAPE SMUT)" with a bunch of them, you can look through that list, here is the link: http://www.mangago.zone/home/mangalist/658536/ I can't say if there will be any books with this type of plot though, they might just be all fluff. I hope this helps!
hey besties,,, uhm yes please. i just cant seem to find something that doesnt involve r. (づ ̄ ³ ̄)づ