Don't assume that they're flirting. After all, that would be INCEST.
Anyway, to get him to do whatever you want him to, you need to start the whole playing thing. He'll probably respond by doing the same and then he'll switch from annoying his sister, to 'annoying' you.
IIN that I get jealous when my boyfriend plays around with his sister?
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Wow.
Don't assume that they're flirting. After all, that would be INCEST.
Anyway, to get him to do whatever you want him to, you need to start the whole playing thing. He'll probably respond by doing the same and then he'll switch from annoying his sister, to 'annoying' you.