Ai no Ondo wo Oshiete yo

Kai spends his days as a sugar baby. One day he's saved by Yuma who happens to be around while he was having an argument with a client. Kai immediately notices Yuma's refined appearance and kind spirit, and asks him to be his "sugar daddy." Surprisingly, Yuma, who's eager to experience new things, accepts Kai's proposal. As time goes by, Kai starts feeling attracted to Yuma, who, unlike his other "daddies", respects him and takes care of him. Despite these acts, there's a reason why Kai can't fully trust him... (Source: Core Magazine, translated)