Knowing that once those teasing fingertips drag down those arms and finally slip into those silky smooth underarms, there'll be no holding it back any longer.
Seeing how effects your tickles and teasing are on her: the goosebumps on her skin, her back arching in response to the feathery touch, the stiffened nipples, the giggles and moans, and doing nothing but encouraging you to keep going.
The sweet, sweet knowledge that its taking all your ler's will power and more to not just straddle your waist and lean in to kiss you passionately and deeply.
The knowledge that with just a little more sexy writhing, moaning, stretching... you have the power to push them right over that edge, unable to resist you for a second longer, knowing exactly how to push their buttons.