I had a gf in college who liked to kneel beside me and stroke my penis very slowly...I would be moaning in delight to the feeling and then she'd suddenly pull back on the base of my cock and grip it hard. This almost always made me groan and jerk upwards. My eyes would roll and my mouth would drop open in surprise, and she would get off on the feeling of control it gave her. I got to think it was pretty hot too. I felt like a toy on a string. THen she'd repeat it again, stroking very softly and slowly and then jerking her hand back hard and violently gripping the base.
She would just strangle the base of my cock until it was frozen and huge, sticking up into the air, with all the veins protruding and pulsing. I'd just stare down at what she was doing with my eyes rolled half way up until she made me come all over my chest. Very hot memory.
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