Why everyone think its AD? Cmon, its obvious!
What author saying through this idiotic moment (as all moments in this manga) - with the person you love you shouldn't rush things ("be to impatient", read last page), you must do it the right way - in the right place with the right atmosphere, not somewhere on the floor of public baths while cleaning it, suddenly kissing her and few moments later swinging your dick around 🤦🏻♂️ at least he should've grab her hand and go to the bedroom...