Just be yourself, anon.
Look like Shirou is pushing the top girl of his school.
Essentially it could be anybody who is on this panel (not counting those who are already impregnated).
Don't be Kuzuki - always remember to bring bug spray with you.
Rider is such a babe
Sakura is a cunt and doesn't even like Rider that much. She wouldn't let her to fuck with Shirou and wouldn't invite her for a threesome too.
Sakura is a selfish bitch and is so much inferior to Rin it hurts.
Sakura is a pure and devoted maiden, after all. Why would she be up for open relationship antics? That kind of thing is for prostitute goddesses like Rin.
Sakura loves Rider a lot. Did you not see Hollow? The only times she is ever mad is when Rider is trying to push up on Shirou after she claims to support her relationship with Shirou.
Had Medusa said she liked Shirou too, Sakura likely would understand and talk it out. That's the big thing, people underestimate how understanding Sakura can be. See HF True, where she is clearly aware of how Rin likes Shirou, but she isn't like, "stay away from my man".