Routine chastity ball draining from behind with 4 ruined orgasms into a glass

My sub has been locked for 2 weeks, and it’s “milking day” in our routine. I get him on all fours on the table, ankles tied apart. After unlocking his cock, I attach a rope to his balls up to the ceiling – keeps them pulled tight. I edge him from behind, aiming his cock into a glass for neatness. I ruin his first orgasm into the glass, then quickly get three more ruined orgasms out of him in succession. After the fourth, his cock is trembling. I do a bit of gentle post-orgasm tickling on it, then for a final twist I dunk his still-hard cock into a glass of ice cubes! It immediately shrinks down enough for me to pop it back in the chastity cage. This clip is a perfect display of a strict keyholder emptying her sub’s balls with no mercy and locking him up again.