He ejaculated in his sister's mouth while his girlfriend unexpectedly arrived

A guy was pleasuring his sister's friend when his real girlfriend walked in on them. He quickly tried to cover up by telling her it was just a friendly hug. His girlfriend, however, was not fooled and confronted the girl about her big boobs and ass. The girl laughed it off, but the guy could see the growing anger in his girlfriend's eyes. As he went to the bathroom to hide, his girlfriend confronted the girl again, this time dropping her towel and revealing her big tits. The girl was shocked and embarrassed, but she was also turned on by the sight. When the guy came out, he was surprised to find his girlfriend and the girl on the couch, with his girlfriend giving the girl a blowjob. The girl then took off her clothes and let the guy fuck her from behind, while his girlfriend watched. The girl even helped him masturbate inside his sister's mouth, leading to a wild threesome with both girls.