Illya-vers's Shirou's friends are quite gay for him. And in 3rei Illya is very desperate for Miyu with her Shirou not even showing up.
Anybody who thinks that the Ending will be anything but Illya/Miyu (with or without subtext) has very big hetgoggles or is just a massive Shiroufag.
Desperate, yes. At the same time she's also screaming 'my best friend'. Of course she won't end with Shirou. 10 bucks on the girls fighting for him at some point during the ending though.
As I said, I understand that almost everything in Prisma Illya is played for jokes and the Shirou harem is no exception. However, if het is something that bothers you (which seems to apply to a lot of people on this site or at least the vocal ones) then it'll be grating nonetheless.
Either way. I don't remember anything about Shirou and his male friends so I won't say anything about that. I think I'm also going to stop talking about the manga as this is the anime thread.