Prom 2009, I'll never forget that one~
I don't really know about a "cute" way; in my junior grade prom I went with a cousin, and in the senior grade prom I went with my girlfriend at the time, where going to each other's prom was kind of a given
Why do you want to ask someone to prom, and why must it be in a cute way. Are you just looking for a couple, or you want someone specifically? In that case, are your plans strictly about going to prom with her, or do you want to use that as an stepping stone to enter some kind of relationship? Is she an acquaintance or a friend?
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To build may have to be the slow and laborious task of years. To destroy can be the thoughtless act of a single day. - Winston Churchill