We were supposed to be on a trip together, but my mom couldn't come because of some sudden work, so it was Yui me and Yui at the hotel! When I was looking at my sister, my penis swelled up, and my sister was worried that I might be sick, so she stuffed it in her mouth and licked it! After a tingling sensation, a lot of white pee came out! But it swelled up again... I squeezed it between my breasts, rubbed it with my hands, and inserted it into my crotch and let it out over and over again! My sister's insides felt so good that I couldn't stop peeing!