My girlfriend is a virgin,14 years old that day I touch her

My girlfriend is a virgin,14 years old that day I touch her breast and kiss with her,also with the mouth to suck her breasts,with the tongue tease her nipples,like this for more than 10 minutes,I asked her if she have water below?She said,no.I asked her,what do you feel?She also said no?They say this is how to return a responsibility?What should I do?