My light-skin ebony girlfriend quietly sucks and rides my cock

I sneaked into my light-skinned ebony girlfriend's bedroom while her stepmom was in the sitting room. My light-skin ebony girlfriend didn’t want her stepmom to hear us, so she quietly took out my cock and gave me a blowjob. I thought my light-skin ebony girlfriend was only going to suck my cock, but she also rides my cock.