Increasingly horny for my beautiful sister 2° part

In the days following the story of my previous post "Increasingly horny for my beautiful sister 1° part" other good moments that made me more and more horny for my sister. One afternoon (sunny) I was standing outside the door of a bar near my house and, in that moment, I see my beautiful sister passing on the sidewalk in little distance in front of the bar, she not had saw me and anyway she was heading to our house (the bar as I said is close our house) she was still dressed in spring, since in that moment in our part of southern of Russia it was still quite warm weather in that september, for up (on her top) I think she was wearing a white sweatshirt and shirt and from underneath short denim shorts with bare legs and with sneakers and small white sports socks, I, of course, I turned from afar and stared at her well noticing her beautiful clothing in particular and obviously (for how she was dressed) her beautiful bare legs half-brown and white-halves :-P and with her beautiful shapes of her beautiful sexy and shapely legs and then next to me an adult gentleman from the bar tells me "ehy... you like her yes? eh eh... and how you look at her! eh eh..." but I didn't want to tell that gentleman that she was my sister but then i tell to him it and I say "That's my sister..." and he replies to me "really? very pretty and very nice! congratulations..." and I answer him with a friendly tone of course "eh... oh well... thanks...". Then a few days later at our house I enter the kitchen where my mother and my sister are staying making a discussion and my sister had that "famous" light-heavenly tight tunic that I told well in my post "The calves of my sister", and I look fixedly at my sister who was a little to the side and a little back to me, and I see her perfect sexy shapes with that tight light heavenly tunic,her ass puffy and tight in that tunic, bare legs with hooves and bare feet, her nice small-medium round and firm boobs (with folded arms), her nice wavy blonde-brown hair, I stayed there as long as possible with the excuse of doing something to be able to see as much time as possible my sister at that moment there, then after a while my sister goes to her room and I too i go to my room and lie on my bed (supine) to take a nap and while my eyes are closed obviously rive I give that beautiful image of my sister when we were in the kitchen as I described before and my cock starts banging hard :-P (but I didn't want to jerk off because I had recently washed and then I was dressed in normal i.e. with clothes to go out) anyway my cock keeps banging very hard and so in that moment there I say to myself (inside of me) "but I have such a hottie sister... but how can I never fuck her??!!...", then always while I'm lying stretched out on bed and supine and with my eyes closed after several very strong pulsations of my cock that had already been hardened to maximum for a while here comes out a good dose of cum i.e. practically I had cummed automatically :-P and so I got dirty a lot inside my underwear and I had to go back to the bathroom to wash myself up again :-P.