I had this problem with my girlfriend, at the beginning i was grabbing her ass and so on but I wasn't hard enough to fuck her, in other words, my dick wasn't getting hard the appropriated time and I was so frustrated that she couldn't even suck it neither grab it... That was a month after we met eachother, a long year passed and now i can even get hard touching her breast and my dick just keeps getting harder and harder.. Maybe i like her even more lol, but I don't know bro. That's all mentally, when you get used to it you just fuck without any kind of problems. Try not touching your dick.
