books for understanding "the drop" and aftercare specifically, not generic ENM 101 stuff

ok so a thing weve started running into now that we're a few yrs in (im in my forties, husband mid forties, in the LS about 5 yrs) is the after effects. not the night of, those weve mostly got sorted. but two or three days later, sometimes me sometimes him, this strange dipped feeling — not regret exactly, more like a comedown, an emotional flatness, occasionally a bit of weepy weirdness out of nowhere. weve started calling it the drop because thats how it feels and ive seen the term used in kink spaces for something similar. the thing is most of the LS books i can find barely mention this, theyre all about the practical stuff and the jealousy at the time, not the 48-hours-later energy crash. the kink books talk about it more but the context is different, theyre talking about scenes not swap nights. is there any decent writing — book, long blog post, podcast episode, anything — that takes "the drop" seriously specifically for swinging or open couples, and that has actual aftercare practices not just a paragraph going "communicate"