Embarrassing moment with coworker?

So, my male coworker and I work the closing shift together. It was about 1 hour before we close, I was recently hired so I’m still training. This customer came and asked for a large order, I didn’t understand his request at first and asked that he repeat it. I wanted to ensure that his order was accurate so I took a paper towel and started writing down his order. I bent over to write and I accidentally pressed into my coworker. I hadn’t realized that he was standing behind me. I quickly moved away and apologized, his face was bright red and he kind of mumbled and his breathing was heavy. I felt so embarrassed! It’s kind of been a bit awkward between us since, when we walk around he squeezes past me and tries to avoid any contact. I was wearing a thong and my butt was accentuated, so it was very much round and I think he might have been slightly aroused. What should I do? Guys, how would you react/feel if this had been you? I just want to know how I could possibly relieve the tension between us and get things back to normal?
Embarrassing moment with coworker?
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