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Harvesting the seed from their brother's productive balls was a daily task, requiring his siblings to help ride him and paw off his cock.  His littlest sister happily volunteered, spreading her legs to allow him inside her.  He entered her tight young pussy and thrust away, his dick finding itself deep within her eight year old body.  She gripped his manhood with her insides and pulled it further in with her hands while her newly pregnant sister offered words of encouragement.  She felt him orgasm and continue, his hot seed warming her from the inside out.  The second ejaculation drained his huge balls completely, her belly filled to the brim with his virile sperm.  Satisfied, she dismounted and leaned on her brother while she squeezed thick ropes of his cum out into a bowl, the morning offering to the family shrine.  They knew that his special seed would bring them much good luck if given to the spirits.