Thinking of asking him "so when are you gonna ask me out?" - guys what do you think?

Yay or nay? Too forward? I'm 100% certain this guy is interested but we haven't had many private time opportunities so it has in fairness been difficult. But just to tease him/ help the situation along I was thinking of saying something along these lines next time I get him alone and cosy with me.

Good idea or bad?
Thinking of asking him "so when are you gonna ask me out?" - guys what do you think?
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