I love reading the techniques where the guy masturbates by using the sofa cushions. Well, I have discovered a way for girls to do the same.
If you have a dildo or anything shaped like it, place it under the cushion of a chair or sofa, so that it sticks out a bit. Put some lube on the tip so that it slides around easily. I love it so much, that I fantasize about being the guy fucking the chair.
(I am rather short, so placing some pillows under my knees is helpful.) Enjoy!