I always lose in the end. The long-tongued older sister got excited when she saw me writhing in agony just from having my sensitive nipples rubbed with her fingernails, and while she licked my erect nipples with her drool-covered tongue, she stroked my rock-hard cock with her hand and milked my semen. Rubbing it over my shirt...rubbing it while kissing...licking it while stroking...my nipples, which are already "too sensitive" to be a weakness, were stimulated in two places at the same time, in a test of endurance between me and my girlfriend.