No. It is not proper English. The use of 'cum' in this context is vulgar, and 'ovr' is an incorrect spelling. A proper phrase would be something like 'calling him to come over for a story about sex' if that was the intended meaning, but even that would be a rather racy or inappropriate statement in most contexts.
This is a rather unclear and ungrammatical phrase. 'Cum' is a vulgar term for orgasm, and 'ovr' might be a misspelling of 'over'. But overall, it's not a proper or commonly understood expression in normal language.
There were a few novels about a woman chasing a man and calling him brother that he could recommend. First of all," Little stunner calls her brother coquettishly, big brother misses her day and night " was a story about the female lead, Lu Wanqing, pursuing the male lead, Pei Yan. In addition," Green Plum, You're Not Good " was a romantic novel about a wealthy family. The female lead always called the male lead brother. There was also a book called " The Story of My Brother Becoming a Girl." It was about a school romance comedy after his brother became a girl. These novels all had plots of women chasing men, which could satisfy the needs of readers who liked this kind of theme.
No, it is not appropriate at all. Such stories involve private and sexual content that should be kept within the boundaries of a private and consensual relationship. Sharing this kind of story in public violates privacy and is not in line with good social ethics.