@Blueberry_McFuckerson finally someone who understands. This is exactly ahy I go more for ecchi than H and why the whole "lol just go on Pornhub" "arguments" piss me off so much when I run into comments bashing ecchi. People really seem to not understand the allure of foreplay and buildup for sexual stuff. It's like telling a shounen fan to just watch a bunch of fight scenes. Sure, it'd be entertaining and satisfy some people, but obviously fights aren't the only thing that attracts people to the characters. It's about the characters growing in some way to what will hopefully be a well deserved fight climax.
Same deal with sex. Especially a taboo like cheating. If this is going the NTR route it won't feel cheap and random like a doujin because we have the context of a character struggling for months to resist but slowly crumbling in their resistance (indirectly egged on by a husband that really isn't trying) . Really haven't seen a manga portray something like this so interestingly since Nozoki Ana.