Covering mouth fetishes

As a child I was always extremely uncomfortable with the idea of being bound or gagged so much to the point that I could not play cowboys and Indians. It would make me uncomfortable when people covered my mouth or other people's and I would get a strange feeling in my stomach when it happened. Recently an old love interest of mine covered my mouth and for some reason I did not get uncomfortable or get the feeling in my stomach. Instead I constantly think back to this moment. I do not know if it is because I am so surprised that it did not make me uncomfortable or if it is because I liked it. But I do not understand why I would like that. What does this mean?