Naturalness, ease, the possibility to feel safe and comfortable with each other and truly relax. When the contact is not forced, not simulated, but natural, this is the best.
I can give a few examples of c2c that have remained in my memory as incredibly pleasant.
One was about 10 years ago when I just started but I still remember it as an incredibly sexy, erotic, fun and enjoyable moment. A middle-aged man just got out of the shower with a towel on his hips and decided to cheer me up - he danced a striptease, but he did it in some "home" playful way (not like strippers do in a club). He was incredible! I loved it!!
I also remember how I had fun online, I turned on fun music, it seems it was Shakira, and invited everyone to the dance, my regular went into private, turned on the camera and joined the dance! You don't have to be a great dancer, emotions are important - I think I will always remember this moment, it was fun!
Once my regular went into private for a naughty moment, he was sure that on that day his sound was not working. But the sound worked. For the first time I heard him moaning, growling, puffing, breathing heavily and loudly, emotionally cum. We always did it c2c, with sound, but he was always very reserved. He was somewhat embarrassed when he realized later that the sound had been turned on. BUT... for me to hear his real reaction was very exciting, hot, I had just best orgasm ever then!
There is a member who comes in private and we do naughty things с2с and then after all he sends kisses and smile. This smile is just something! It warms! I love this moment the most.
There are many things that are pleasant, but it all depends on sincerity and on the person.