Most of the routes seem relatively versatile, but I think it would have been nice to have the choice of whether to top/bottom first time with Darius as with Spencer. Think him bottoming first was not really in line with his character. But oh well.
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Actually it really needed to be that way since it was the only way the MC could be certain about how Darius really felt about him (since Darius keeps saying he NEVER bottoms). If Darius topped first, it would seem as if it was just his final attempt to have sex with the MC.
And technically Darius was on top, sort of. :)
I considered that, but at the same time, a complete 180 of his always top personality doesn't seem overly sincere or true to himself. He also admits that he has never actually gone all the way with any of his "flings", so the fact that he does with MC should be proof enough. But I do see the validity of your argument, just wish we had a little more agency in the way things unfold.