Rubbin the Sheets

I remember a few times when I was about 12 or 13, I used to use my bed sheets as I masturbated. I would be lying in bed, gently rubbing my penis and balls, I would get an erection. I'd slowly rub and stroke my penis head, and my anus, which I still find very stimulating and erotic to touch. I would strip out of underwear and rub some more, until I was quite excited. I would then take my top sheet, put it between my legs, with my legs sticking out. The rest of my body would be covered. I grab a hold of the base of my penis, make sure the sheet was tight, and start to rub my penis head back and forth on the sheet. The sensations were so great, almost like a burning, or a sharp rubbing feeling. I would lay there and fantasize, and could feel my orgasm nearing. I would rub a little faster, and lube my finger and stroke my anus. I would cum so hard from that, I didn't care about getting it on my sheets, it just added to the erotic moment I was feeling. Just thinking about this past moment is making me hard and very horny, I know how I can take care of it!!