I unfortunately was kind of disappointed by this. Which is not to say that I think it is bad, but it just felt like something was missing compared to the main VN and after mulling over it a bit for me it comes down to what feels like the ultimate goal or purpose of the work. A lot of what I really like about the sex in Dawn Chorus is that it is full of tension, unease, a kind of excitement and perhaps most crucially the sex is never the most interesting thing going on.
Which I guess I just didn't really feel that in BH, the sex was kind of the most interesting thing and it was fine but also kind of whatever. and maybe that's all it was meant to be, a kind of nice pleasant short but there is a clear gesture towards a sort of melancholy and sadness and greater meaning which keeps it from being pleasant but also it does not really go far enough to have a real thrust or impact. It almost feels stuck in between the two ends.
Despite my criticisms I would still urge people to buy it though, because any money given to the development team is money well spent and they're doing really great stuff this one just sadly didn't really feel as good to me :(