The author treads on thin ice by oversexualizing this manga and cockblocking events at the same time. It was funny to read at the start, but now it's more and more frustrating.
I understand that girls are in heat. I can also understand that the bear is impotent with zero sexual drive. But joke repeated too much isn't funny anymore. It's time to show some development or to close this sexual theme.
Sadly, cockblocking is a traditional Japanese genre already.