Fist4 k - Fisting or masturbation?

Marcellus LOVED sex and hated it when his girlfriend sneaked away to masturbate without him. He considered it cheating, of sorts - after all, why would someone ever turn down the opportunity to fuck such a studmuffin! That day, he came home early and busted his girlfriend as she was feverishly rubbing her pink slit. Marcellus decided to play a little game with her. He carefully sat closer towards her, motioned her to keep going, and started to tease her clit with his palm. He caressed her lower lips and clit prior to slowly but surely shoving his arm in her warm pussy. His fist entered her waiting snatch fully - the girl started moaning with pleasure! It was a fresh, mind-blowing experience for her!