My (M26) relationship changed after my GF (F28) sucked and pinched my male nipples

My (M26) gf (F28) and I started dating during our final semester at university (we were M22 and F24). The sexual side of our relationship started off conventional with some light domination from me. Light choking, ass spanking, her calling me daddy.

Usually when we were in missionary her hands would roam my chest. Sometimes she would slyly move her fingers to my nipples and rub in small circles. I would promptly push her hands away and she would giggle and say, "I know you secretly want me to play with them". I would tell her, "not interested".

This went on, sort of as a joke, for about two years. 2 years later as we got to exploring our kinks more. One steamy night in particular, she had restrained my hands and blindfolded me. She had me on my back and was riding me. We had done this before. However this time, she began to slow the pace of the riding and eventually came to a stop and just sat on my cock. I heard her spit. Seconds later I felt a sensation on my nipples, as her spit covered fingers graised across them. I let out an uncontrolled moan. I was so embarrassed.

Her lubed up fingers gliding across them stimulated me like I had never felt before. She leaned in while still massaging them and whispered in my ear, "I knew you had always wanted it". With that she plunged her tongue into my ear.

So here I was. Hands restrained, blindfolded, gf balls deep just sitting on my cock, playing with my nipples, with a tongue in my ear and I felt an orgasm coming on. I felt the embarrassment grow stronger since she wasn't even riding my cock. She could tell I was getting close and whispered in my ear, "cum for me baby" and at the same time, pinched my nipples. I came one of the largest loads in my life. Overcome with uncontrolled shaking.

Needless to say I couldn't deny the nipple play anymore and after that she began dominating our sexual relationship a lot more. I might post some more stories regarding that also.

That was also the first time she had called me baby instead of daddy during sex.