Saw my sister naked for the first time in a long time

I'm a college student but I always come home for the weekend. My sister is 18 and she has her own bedroom. She never locks her door and when growing up she would sometimes flash me but then she just became more modest and stuff. I didn't see her naked again until now. My mother and father were out.<br><br>We were hanging out in the living room with a mutual friend of ours when she got up and said she was gonna take a shower. She was wearing one of those long T shirts that go past the waist and it kind of seemed like she didn't have underwear. I didn't think much of it.<br><br>She went into her room and shut the door and she was just changing. She left the door open when she came out and I saw her naked again but then she quickly covered herself and rushed into the bathroom. She didn't say anything. She just covered herself. I didn't say anything. Then when she came back out from her shower, she had a towel around her and continued to get dressed.<br><br>I didn't see her completely naked but I did see all of her butt and from the side, her breasts. I don't know why I'm just now posting this. I've imagined her naked and having sex with me.<br><br>&#x200B;