My (21M) sister (19F) is a total babe

My and my sister are both active in my family's snowboarding club. We ride around a lot and help the kids that are struggling. It has been this winter season (2019-2020) that the first snow finally fell (it's largely a problem this year unfortunately) and my sister and I are riding together up and down the slopes for fun.<br><br>As we're both relatively hot because of the physical exertion we are both largely dressed in just black thermal shirts (so we can see each other from a distance). For the first time, I really had to notice how hot my sister is though. I'm not even kidding, she even outclasses Jen because of her fit athletic build.<br><br>So, I largely started to imagine her in my bed (I've been having sex with my sister for a while now, but just as something fun to do together so to say), and it got me pretty hot.<br><br>So, I asked my sister "Hey... wanna come with me to the bathroom?". She looked at me and grinned while answering with "Okay, but you know that's gonna be a tight fit, right?" and then we went into the bathroom to fuck.<br><br>We were so into it that we had to hold ourselves back from making too much noise. We both had a wonderful orgasm, and even though we had to cancel for the rest of the day, I found it to be worth it.