My little Brother's Enormous Cock

I'm Cathy 25 and live with my brother David 23 our mother died 12 years ago in a car accident and father passed last due to coronavirus. No relatives living close so it was just David and me . I work in admin and David works as a mechanic and everything was going on fine. Until the end of June when I came home from the beach and walked into the bathroom to shower. But David was already there and totally naked and not only did see him fully naked I saw that monster hanging between his legs. He was drying his hair and had the towel over his eyes and didn't see me. His cock was just hanging there between his not erect and it was about 8 inches long on the slack. I had always called David little Guy as he was my younger brother and only 5'4" tall, but of a solid build. David had always ben into cars and so he became a mechanic. I had never dreamed he had a monster cock like he does. I quickly left the bathroom and went to my room and started to play with myself. I had recently broken up with my boyfriend and I was just hanging out with my girlfriends and wasn't looking for anther boyfriend very hard. David rarely dated and was a car mad our late father use to say. He would rather play with a car then a girl. Now I had seen his cock it started to haunt my thoughts, I became determined to get him to fuck just once. I started by walking around the house barely dress at all. But he took no notice or hid it well, so on a stormy Saturday night I just got into his bed with saying I was scared of the storm and cuddled up to him. My nightie didn't hide much if anything. He just laid there not doing anything and so I decided to push it along and ran my hands all over his body. Then settling on his semi hard cock and taking it as a sign he was getting horny started to stroke the monster and it went rock hard. I told him I wanted him and he fucked me with that weapon of his. At first it was like my first fuck, but as my vagina stretched to the size of his cock it became very enjoyable. Never had I had suck a large cock in me. We fuck again in the morning and I had him move into the master bedroom with me after that. We've been fucking regularly since and I'm not looking for another boyfriend anytime soon, my best friend Suzie 24 is without a boyfriend and we have slept together several times and enjoy a lesbian style sexual relationship. Up until now she is the only person outside of David and me I've told and last weekend we had a threesome with David. Suzie has decided to move in with us and we are going to share David.