Why Are Boobs So Pleasing I Need Advice With Playing With Boobs Please Help?

I need advice with playing with boobs please help? - why are boobs so pleasing

My girlfriend and I started out, and I get very nervous when it comes to my first question, I do not know what to do to stop it afterwards. It is likely, as the play with her breasts or sucking or biting? I have no idea what you do to help.