What does it mean if your boyfriend gets an erection?

jenni207
I was at school and he was holding me from the back and he suddenly like bends me backwards and starts kissing me and I was startled but I let it go. It all happened so fast and my friends were standing around and they told me they saw him you know, get bigger...it shocked me. No guy has ever had one around me, and we weren't being sexual or anything towards each other.
What does it mean if your boyfriend gets an erection?
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