Responses
I've been that way when I met my ex. No physical contact other than family, when he kissed me the first time I just lost my mind and went crazy for him and ended up sleeping together that night (no alcohol involved either). It'd been 6-8 years since I'd been with someone as I'm very shy irl, so I was very touch starved. I felt that scene was very realistic from having experienced it myself.
There are still a ways to go before they reached this stage...
Moreover, Naeyoung's gap moe felt unnecessary, what with him initiating the sex (cause Jin had made his intention crystal from the get-go, so obviously he won't deny the guy he's crushing on). Did Naeyoung really get caught in the heat of the moment or had he really not realized how touch-starved his trauma had left him until Jin kissed him? (could it be that it's an intense reaction to a positive or relatively harmless touch? something im sure he hasn't experienced in a long while.) idk man yall tell me...