I really love my current girlfriend, and since she loves me so much, I never try to play behind her back, even though I currently have so many nice girls around my place. We also promise each other that we won't break virginity until marriage.
However, one night in her house, when we kissed together, my hands slipped inside her t-shirt and strayed all over her body and just before they arrived at her tits, my eyes caught hers and she gave me an approval look. So I gently caressed her small tits and pinched her nipples. After a long embrace, we sat side by side. Instead of angry or felt guilty, she asked me if I thought her tits were too small. But I said they were beautiful, for I cared about overall beauty instead of merely size. Since then, she always allows me to touch and kiss her tits and suck the nipples.
One evening I ventured to touch her lower parts, beneath her panties. She seemed reluctant this time, so to make her comfortable I gently pulled her hand and ask her to grab my boner under my shorts. She gently rubbed mine, and I touched hers. However it was a gradual process until both of us felt comfortable to play with each other's genitals. One night she lay topless and she grabbed my uncut cock and played with it. I played with her nipples. After a while I told her that I wanted to cum. She told me to cum on her tits. She removed her hands and I kneeled with my cock over her tits. I stroked it harder and sprayed all the cum on her tits and cleavage. I cleaned her tits with a wet paper towel.
We find times when we are alone in her home or mine to fondle together and masturbate if we can. She now allows me to lower her panties so I can see her unshaved vagina. She has a sizable clit and I love to gently stroke it and let her juice moisten it. We are so open and love to embrace each other while naked or half naked, and masturbate together.
We love to masturbate together because we love each other. I thanked all the married couples here who have shared their marital masturbation experience as an inspiration for me to do the same with my future wife.