bondage...
ur senses become supersensitive when blindfold, gag, and tie-up...
the stimulation of the rope and his/her finger running through ur body....
the looks on his/her face when he/she moan, struggle, and squirm...
likes the excitement of been force to cum ?
try bondage... rope, wire, kinky hand-cuffs, feather, cloth pins, vibrator.....etc
of course, u and ur partner would need to trust each other and talk about it before even trying.... "needs a certain level of trust"