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The boyfriend is a hardcore cuck who gets off on real cuckold stuff. He also has a micropenis and apparently a small sperm count. In addition, he's not very good at sex and his girlfriend has never gotten off with him. She learns real sex from the bull and is convinced to have a child with him due to the boyfriend's traits (the boyfriend agrees, since that's his fetish). Despite that, this never goes into real netorare territory. The end says the two get married and raise a happy family, but that the child (or children) aren't blood related to the MC.

Base +18