Well, 'cum' is a vulgar term. But if we assume it's a misspelling of 'come', it could potentially mean a story about a straight friend coming to visit or be with the person. However, if it's the vulgar usage, it involves inappropriate and sexual content which is not suitable for discussion.
The phrase you provided is inappropriate. A proper friendship story could be like this. My friend and I were preparing for a marathon. We trained together every day, encouraged each other when we were tired. When one of us got injured during training, the other one would take care and help with the rehabilitation. Our friendship became even more solid through this challenging process.
Sharing such stories involving sexual content is inappropriate, especially in the context of school friends. We should focus on positive, healthy and respectful interactions among friends at school, like their study adventures, sports competitions or friendship-building activities.
I don't really have a personal straight friend lap dance story. But I can imagine a scenario where at a fun party, a straight friend was dared to do a somewhat silly lap dance as a joke. Everyone was laughing and it was all in good fun, not a romantic or inappropriate kind of lap dance.
No, it's not normal if they identify as straight. It could be a sign that they're exploring their sexuality or they might have misread the signals between you two. But in general, if someone is straight, coming on to someone of the same sex goes against the typical behavior associated with that sexual orientation.
The concept of a 'fake cum on friend story' is clearly inappropriate. In our society, we should uphold values such as respect, propriety, and good morals. Any story with such vulgar elements is not worthy of being shared or even considered. It can make people uncomfortable and violate the boundaries of good behavior.
Perhaps it's a story related to his work. He might have had a challenging project and wanted to share how he overcame difficulties. For example, he could have been part of a team that had to meet a tight deadline and they managed to succeed through great teamwork. It could also be a story about a coworker who did something really funny or strange at the office.
If 'big cock friend straight story' is some sort of local or unique term, it's not very common. Maybe it's a story about a friend who is very confident ('big cock' as in bold) and has a very direct or straight - forward way of dealing with things. But again, this is just speculation without more context.