Thus began a summer-long relationship between my little sister Val and me. We masturbated simultaneously, in the sauna, facing each other, about once a week or so for the rest of the summer. The second time we did it, we both got completely naked; me getting my first view of Val's gorgeous, perfect young body in its entirety. God, she was hot. Perfectly tanned 21 year old skin, legs to die for...and that pussy, with those fleshy, pinkish-brown lips, the type that always looked swollen. That second time I came within just a few minutes. But, over time, we learned how to prolong our sessions into half hour, 45 minutes,...