Big filled up balls with saline in rubber. For the treatment you need some sterile saline NACL solution, one or better two infusion needles or butterfly canula and some connecting tubes for filling. The needles are a bit painful for the first moment, but your rubberslave must take them if he wants to have a horny filling. 500 ccm of saline is perfect and you need about 15 to 20 minutes for the filling. Not to fast and take care for a warm place. After the time you have a wonderful big result, which will be like that for 1 or 2 days. Of course you can have fun with the balls during that time, no problem. During the transmission time give him a vibrating toy or let him lick your nipples and after the 20 minutes remove the needles and you can have some fun with him. Licking the big balls is soooooo horny. Hmmmm. And a kinky saline blowjob, some minutes later your patient will give you the result. Smile. Have a look here for the result after 20 minutes and 500 ccm of saline. Great ha? What a horny thing to do. Enjoy it.