You don’t have to ask him whether he wants to keep coming, but at 15 his dad can open up conversations about what DS needs and wants their relationship to look like and how best to facilitate it so that it works for his DS.
Quite often teenagers feels deeply obligated to just keep doing contact the way they did when they were 10. Even though it means they can’t participate properly in social activities or whatever. They don’t want to upset dad so they just don’t say anything.
I certainly did. Even at 17 I felt totally obligated to do EOW contact with my dad where he lived on the other side of the city, and I didn’t feel that I could make plans to see my friends in the city centre because I was supposed to be seeing my dad. It wasn’t great at all. But I couldn’t say anything because I knew my dad would take it as a rejection and be difficult. Whereas when I was home at my mum’s, I mostly spent my time with my friends - staying at their houses/having them stay over, going into town, and so on. I didn’t want to replicate that at a different house EOW (even if I felt I could); I just wanted to be able to hang out with my friends on our side of the city.
There are ways to create openings for your DSS to tell you what his needs for his relationship with his dad. He’s growing up and it’s positive that things change. Getting him to feel confident that his dad will never feel rejected or upset about him wanting to do things differently is important.
He might be totally happy with EOW at dad’s where he hangs out in his room. Or he might want things to change in some way but not have any idea how to make that happen. Or even what that would look like. Give him easy, safe opportunities to talk about it and be open to doing things differently.
In the longer term, it’s extremely positive because DSS and his father will be able to have their relationship the way that works for them, rather than according to set patterns of contact.