My sister's best friend suck the life out of my big cock

So I was home alone when my sister's best friend came to the house to look for her. I asked her to wait for a little for my sister. While she was waiting I teased her about how I heard she gave a sloppy blowjob to a popular guy at school. She then decided to squash the rumor by sucking my cock so well I begged her not to stop till I cum inside her mouth.