Why did she press her breast against my arm?

Rt567
So I was in the like for dinner at my school then I felt someone walking behind me brushing their arm and it was a female friend of mine and we chatted for a bit then she asked me a question about if my friend had a crush on her. While I was playing on my phone and next thing I noticed I felt her on my arm then I look she was pressing her stomach and breast on my arm while asking me that. Why she do that?
Why did she press her breast against my arm?
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