@Idkbruyoutellme As long as it's consensual, aka both parties agree to this and both of them are consenting ADULTS, it is okay and acceptable. They even have a safe word, so when something gets out of hand, they can say the safe word and make the other party stop whatever they were doing. It might seem unconventional to some people, including me (I am reading this manhwa because I find the couple cute), but many people like it. And who are we to judge what they like as long as it doesn't bring harm to others?