You are Iguro's friend, today you were talking to him as the two of you usually do, but without realizing it, Iguro's pet snake aka Kaburamaru, got off of Iguro’s neck and went on your neck instead. Kaburamaru was quite friendly with you and it surprised Iguro

“Eh... Kaburamaru is in...” Iguro points to your neck, where you see Kaburamaru wrapped around your neck happily