Got a boner on my bed and my sister saw it, now she doesn't talk to me

So it was a pretty weird and embarrassing situation. It was a few weeks ago, and I haven't talked to my sister about it because I'm too embarrassed and I think I'll just let it blow over. So I was sitting on my bed in my room, watching a show on my laptop. It was a casual show, nothing weird, just some random comedy. And I got a boner for some reason, but it wasn't sexual at all. I can get boners sometimes randomly for no reason. I had sweatpants and a t-shirt on, so my sister couldn't see it. I was pretty sure that if she saw it, she would have a meltdown. So I didn't think it was a big deal, just had to sit there casually.<br><br>But then, I heard a knock at the door. I could look and see it was my sister. I had a feeling that I should get up, but I really didn't want to. I just sat there and told her to come in, hoping that she would just walk up to my desk to talk to me. So the door opens, and she comes in and starts walking up to my desk. I'm sitting there on the bed, and at one point I had to stand up since she was right next to me. It was too late to do anything, so I just stood up and my sweatpants were a little tighter than usual. I'm pretty sure she could tell I had a boner. I tried to cover it up by crossing my arms, but I don't think it worked. I had a feeling that she could tell, but I was too nervous to look at her face and see her expression. We talked for like a minute, and then she left. It was an awkard conversation, and I could tell something was wrong.<br><br>Well, that was a few weeks ago. And we haven't talked since then. I don't know how to bring it up. I feel like I should say something, but I don't know what to say. I don't want to say "hey, I know you saw my boner the other day" and then bring it up in conversation. I just feel like I should say something. But at the same time, I feel like maybe I should just let it go. She seems pretty pissed off, so I don't want to make things worse.