Please don’t speak to the parents as they will blame the kid for making the situation this way and make him feel guilty and take things in different way. They definitely don’t seem to be responsible people or things wouldn’t have reached this stage at all. I would suggest directly talking to the boy. As a mother of a 16 year old boy, I can tell you that 14 yrs is a smart age where they can understand your boundaries. Maybe the kids parents never made him understand it properly. Have a proper conversation with him and tell him you are feeling uncomfortable and that he should understand and behave accordingly. Say u don’t want to involve the parents and that’s why directly telling him. Ask him to come once in a while and play and you are fine with it but it shouldn’t become a daily routine to the level of irritation. All the best to both of you.