There may be relationships ahead in any of the series. Though I’m not an expert in any way on relationships in general since I’m ace, there are definitely plans in the works. Nothing sexual ever, of course. Neither Sam or Dean are celibate by any means, and I plan on staying as true to the series as possible, of course.
I think they’ve worked in at least some relationships in the last few seasons… though Dean is ruined for women right now and it upsets me to see him so torn.