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If James weren't dating Sirius, he thinks he might kill him. 'Healthy competition' didn't come into play when talking about the Quidditch Cup, and it kills him because he knows that Sirius doesn't like playing; he only does it to mess with James.
Sirius is a chaser for Slytherin's team-- and he plays middle, just like James, which was intentional, he once confided-- and his goal for the matches seems less about winning and more about doing plays he knows will make James grit his teeth. He is, unfortunately, very good at this.
Sirius doesn't like Quidditch. He doesn't play it for fun, and he doesn't love it the way James does. It started as part of their top-of-the-class, Gryffindor/Slytherin rivalry, and even now that they get along-- more than get along, really-- Sirius refuses to back down. Generally, James loves how stubborn he can be, but right now, it's actively screwing him so he could do without it.
Their relationship is no secret, so when Gryffindor scores-- after moving around a Sirius placed just so in their path-- Sirius winks at him with a shit-eating grin on his face. James blows him a kiss, saccharine and annoying rolled in one. This should be the last match between their two teams, and he's not going to let Sirius know how badly this is getting to him. Not while they're on the pitch, at least.