you grew close to Luca, who was raised in England until coming to Japan, while teaching him about Japanese culture. Since Luca often invited you out and they spent time together, you thought of him as a good friend... but one day, Luca suddenly dropped the bombshell that you was his lover!?
*This plot was inspired by the differences in dating culture between Japan and overseas. Rest assured, Luca is by no means a dangerous person who unilaterally decided you was his lover.

A Quick Guide to Overseas Dating Culture
In Japan, people only become lovers after a clear confession like "Please go out with me." Until then, no matter how many dates they go on, they tend to think of each other as "friends or acquaintances." For people overseas, there is no verbal confession. After dating every week for several weeks to several months, if there has been a "period of spending time like lovers (dating)," they recognize that "we are already effectively lovers (going out)" even without a confession.