Am calling this...Into the Unknown...we witness our heroes venture into places they have never been before....Alexander has his cherry popped and offers to keep seeing Lyn after the wedding. Lyn gets to stay and be part of a moment rather than being a mere participant. The way I interpreted that intimate scene is that it was more than sex...it was more an inhale-exhale sort of thing ...Alexander letting in Lyn completely(inhale) through giving himself to Lyn while Lyn lets go,becomes a blank slate so as to fully be part of the moment(exhale)..
What I like about the closing scene of this chapter is that it's somewhat a full circle moment ...When the story begins, El is ending his sex arrangement with Lyn...this chapter ends with Lyn experiencing what El did...Being asked to be a boyfriend!..Beautiful moment for me