My sister saw my boyfriend naked and I'm concerned about their behavior now or am I being paranoid?

Last night family got in town and the house is more crowed now so my boyfriend would sleep on the couch so my mom could take our bed with my sister. He had to work early so began sleeping in our bed and agreed to swap into the couch when the were ready for bed. A FEW HOURS later I woke him so he could switch to the couch. I was fixing the pillows and glanced up to see that he is completely naked casually walking down the hall towards the living room. That's when my sister passed by him but not before she paused to get a good look. Mom saw him too I know it but hasn't mentioned it. My sister hasn't either. Just feel like she would have said something to me about it. She is 15 and we have always been close yet she hides this from me
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Heh
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So today I've just kinda been kinda watching closer but waiting to see if anyone brings it up. I feel something everytime I enter a room and it appears they in mid convo or something. And they both seem super happy moods ugh.
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So after another week went by I had to know for sure what was up... we threw a bon fire together with a few friends and I pretended to get hammered and eventually pass out so I can see for myself how they acted when I wasn't around. After everyone left I saw them talking by the fire when they began to kiss. They made out with each other for about 5 mins b4 I called his cell phone to interupt them. I'm so lost and hurt! :(
My sister saw my boyfriend naked and I'm concerned about their behavior now or am I being paranoid?
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