contractions (contacting)
pulsing (pulse)
throbbing (throb)
pulsating (pulsate)
orgasming
puckering
例
orgasmic contractions 絶頂時の収縮
pussy pulsing orgasm マンコヒクヒクイキ
pussy throb マンコのヒクつき
asshole puckering orgasm, butthole winking orgasmケツ穴すぼまりイキw(かなりレアな言い方)