Just a bit of a back story to this and details so you can have better visualisation

This is a true story of recent events, myself Steven 6foot, athletic build, brown hair and olive skin, 18years old. I have always been attracted to my Aunt Katherine 5foot 5inches, brunette, b cup boobs, very big round ass, 42years old and smoking hot. Also I was a virgin before this, I just have never payed much attention to girls. My aunt is single and has been for 3years since she spilt from her partner of 17years

What happened

It was a Saturday morning and I was really bored so I decided to go visit my Aunt, she lives an hours drive so I left at 11am and arrived at midday. When I arrived I found she wasn’t home so I called her to let her know I would was over to visit and see where she was, she said she was at a friends house and would be home in an hour. So I decided to enter my aunts house and wait inside until she arrived, I have my own set of keys for her place. Once inside i needed to go to the toilet, after I had been to the toilet I went to go sit in the lounge room and watch TV, as I walked through the laundry (to get to the toilet and get out of it you have to go through the laundry) anyways as I walked through the laundry I noticed on top of her clothes basket were a pair of her underwear. I have gone through her underwear many times and jerked off with them, however I had never been able to use her used ones as I never had the chance. I then grabbed my aunts black knickers and sniffed, I could smell the juices from her pussy this gave me a major hard on. My dick is just under 10inches long, 24cm to be exact when hard and it’s very thick and veiny, I started using my aunts underwear to jerk off.

After a few minutes I was just about to blow my load when I heard the roller door go up. My aunt was home much earlier than she had implied. I quickly threw her underwear into the basket then ran into the toilet. Once my aunt was inside she called out “Steven are you here?” I replied “yes I’m just in the toilet, I will be out in a minute” my Cock was ragging hard and wouldn’t go down so I tucked it into my pants but there was a very noticeable bulge. I hoped my aunt wouldn’t notice in case she was to get angry. I then went into the kitchen and greeted her, I immediately noticed her sneakily looking at the bulge in my pants.