Plus one to my sister's wedding?

My sister is getting married this year and since I'm single as a Pringle and nearly all of my cousins have boyfriends, I'd like to ask this guy with for some company for myself and for the other 20+ year old at the wedding. We've had nice long talks three or four times and he's super sweet but I'm afraid if I ask him he'll think it's as a date and chicken out. Advice?

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