Catbath is like using your boobs to move up and down your partner's body, to achieve a less friction process, use baby oil on his and your body. Also can use your nipples to rub against his body, occasionally doing tongue licking into his earlobe, then say some dirty things to enhance the experience.
Turn his stomach down and use your boobs to rub him slowly from the back to the butt Rub your finger between his asscrack to stimulate him more. Let him turn rock hard!
Squeeze your boobs between his dick and rub it, look at him with a slutty face and try to boob fuck him to cum all over your breasts. My 2 cents experience.