What should I do?

When I was about 4 or 5 years old , we were to living in apartments and my cousins lived across from us. One day my older cousin asked if I wanted to play with him so I said yes and he grabbed my hand took me to his apartment, then up to his parents bedroom . He told me the game we were gonna play had to be in the dark so he closed the curtains locked the door and turned off the lights. Then he told me open my mouth and suck on his finger. When he took his finger out of mouth , he said he was going do it again with another finger and I faintly remember hearing him unzip his pants ..... and that's all I remember , the rest is a blur. I'm not sure if anything happened because I don't remember and I'm scared that he might've done something to me or that he did it something to my other my other cousins( who also lived nearby) Because I don't remember, i don't know if I should speak out about this, especially since it was more than 10 years ago .