My girlfriends little sister hid with me underneath the bed and my girlfriend got mad due to position. Do you think she overreacted?

We were playing hide and seek. Still with our swimming gear and a little wet. My girlfriend was the seeker and it was like 4 other friends too. It’s a big house so lots of hiding places. I hid underneath the bed first and my girlfriends little sister who is 23 hid underneath the bed with her butt facing my private area. I’m not going to lie. We slightly were touching a bit and I got naturally and uncontrollably turned on. When she found us, she started cussing and overreacted ending the game. She started saying why were both under the bed and if we were “fucking” and started accusing us. My girlfriends little sister is the one that moved her butt towards my private area. I didn’t invite anything.
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My girlfriends little sister hid with me underneath the bed and my girlfriend got mad due to position. Do you think she overreacted?
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