Hey why not?

I did say that I enjoy making headcanons.

So, here we go!

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Relationship: with master!reader

*Okay my very first mental image was of cu flirting with another person just for his s/o to wack him. Operation failed successfully.
Don't worry he loves you so the flirting is probably done simply to get a reaction from you.

*He would so help you learn how to spar if you ever show an interest in it; although you aren't ever able to beat him, you are able to hold your own, which is very helpful when going through a mission.

*He's pretty competitive, especially with EMIYA and the other versions of himself. He probably boasts about you a lot to the other servants.

*Cu's interlude took place in the very early stages of your relationship and was probably among the first servants you summoned. After he stormed away from the chimera stew, it left you with a festering feeling of guilt about something that you know you should've known beforehand.

*it's what motivates you to do as much research on the individual servants you summon as possible, so you don't make the same mistake again. He's noticed how you stay up late reading up on all the new servants you summon just to make them feel more welcome.

*Once you get over that hiccup...it's relatively smooth sailing, I mean you're bound to have your disagreements but it's nothing new

Wow that was a short list

I'm kinda new to the writing headcanons for fate servants thing

Anyway hope you enjoyed!